The document summarizes key structures and functions of the eye. It describes the three layers of the eye - outer sclera, middle choroid and vascular layer, and inner retina. It provides details on structures in each layer like the cornea, iris, ciliary body, aqueous humor, and lens. Diagrams are included to illustrate the anatomical relationships between different ocular tissues.
The lacrimal apparatus is the physiological system containing the orbital structures for tear production and drainage. It consists of: The lacrimal gland, which secretes the tears, and its excretory ducts, which convey the fluid to the surface of the human eye;it is a serous gland located in lacrimal fossa.
The epithelium lining the respiratory tract from the nasal fossa through the bronchi is called the respiratory mucosa and is characterized by a pseudostratified ciliated epithelium with abundant non-ciliated cells known as goblet cells. - [Source: medcell.med.yale.edu/histology/respiratory_system_lab.php]
The lacrimal apparatus is the physiological system containing the orbital structures for tear production and drainage. It consists of: The lacrimal gland, which secretes the tears, and its excretory ducts, which convey the fluid to the surface of the human eye;it is a serous gland located in lacrimal fossa.
The epithelium lining the respiratory tract from the nasal fossa through the bronchi is called the respiratory mucosa and is characterized by a pseudostratified ciliated epithelium with abundant non-ciliated cells known as goblet cells. - [Source: medcell.med.yale.edu/histology/respiratory_system_lab.php]
The lymphatic system consists of organs, ducts, and nodes. It transports a watery clear fluid called LYMPH distributes immune cells and other factors throughout the body.
The lymphatic system consists of organs, ducts, and nodes. It transports a watery clear fluid called LYMPH distributes immune cells and other factors throughout the body.
Histology of the eye by a very good docotor in iraqi uni collage of medZaraVvv
Simple explanation about the eye, which is very specific and illustrated about histology of the eye it’s going to be very benefit and is actually very good actually benefit me very much it is published by a doctor in iraqi university. It’s illustrates the matter in a very simple way, and helps the student to understand the matter. Help to understand the histology and anatomy of the eye.
The Atlas of the eye is a B.sc. degree research
It contains three parts:
- Anatomy & Physiology of the eye
- Pathology & errors in the eye
- Photography of the eye
enjoy it!
This lecture includes anatomy, Physiology of Sclera, if u like it kindly share it with colleagues and like it. I will share more lectures related to eye anatomy and optometry.
Thank You.
Slide Presentation for Anatomy of Eyeball. This slide is taken from Medicos Pdf app available in playstore. This app contains many more slides related to clinical science, basi science, nursing, dental and many more. You can download if you want many more slides.
Servers: Servers are the backbone of e-commerce websites. They store the website data, including product information, customer details, and transactional data. They are responsible for processing customer requests, generating dynamic content, and serving web pages to customers.
Storage devices: Storage devices such as hard disk drives (HDDs) or solid-state drives (SSDs) are used to store the website data and application files. They provide the necessary storage capacity to accommodate large amounts of data, such as product images, videos, and customer information.
Routers and switches: Routers and switches are used to connect the e-commerce website to the internet and facilitate data transfer between different devices. They help to ensure that data is transmitted quickly and reliably, and that the website is accessible to customers from anywhere in the world.
Firewalls: Firewalls are used to protect the e-commerce website from unauthorized access and malicious attacks. They monitor incoming and outgoing network traffic
There are several challenges associated with the trade cycle in e-commerce, which can affect the overall efficiency and effectiveness of the process. Some of these challenges include:
Security: One of the main challenges in e-commerce is ensuring the security of the transaction. This includes protecting sensitive data such as credit card information and personal details from theft, fraud, and other cyber threats.
Logistics: Shipping and delivery can be a significant challenge in e-commerce, particularly for products that require special handling or transportation. This includes ensuring timely delivery, tracking shipments, and dealing with returns and exchanges.
Payment processing: Payment processing can be complex, particularly for cross-border transactions involving different currencies and payment systems. It is essential to ensure that payment methods are secure, reliable, and convenient for customers.
The trade cycle in e-commerce refers to the various stages involved in a typical online transaction between a buyer and a seller. The trade cycle typically includes the following stages:
Product search and selection: The buyer searches for a product or service online and selects the desired item from the e-commerce website. This may involve browsing product categories, using search filters, and reading product descriptions and reviews.
Shopping cart and checkout: Once the buyer has selected the desired item, they add it to their shopping cart and proceed to checkout. At this stage, they may be required to enter their personal and payment information, such as name, address, and credit card details.
Order processing: After the buyer has completed the checkout process, the seller receives the order and processes it. This may involve verifying the availability of the product, preparing it for shipment, and generating a shipping label.
Payment processing: Once the order has been processed, the payment is processed by the payment gateway. This involves verifying the payment information and authorizing the transaction.
Shipping and delivery: The seller ships the product to the buyer's address using a third-party logistics provider or their own delivery service. The buyer is provided with tracking information to monitor the status of the shipment.
Returns and refunds: If the buyer is not satisfied with the product, they may initiate a return or exchange. The seller handles the return or exchange process and ensures that the buyer is satisfied with their purchase.
Customer service: The seller provides customer service to address any issues or concerns that the buyer may have regarding the product or service.
Knee anatomy and clinical tests 2024.pdfvimalpl1234
This includes all relevant anatomy and clinical tests compiled from standard textbooks, Campbell,netter etc..It is comprehensive and best suited for orthopaedicians and orthopaedic residents.
Title: Sense of Smell
Presenter: Dr. Faiza, Assistant Professor of Physiology
Qualifications:
MBBS (Best Graduate, AIMC Lahore)
FCPS Physiology
ICMT, CHPE, DHPE (STMU)
MPH (GC University, Faisalabad)
MBA (Virtual University of Pakistan)
Learning Objectives:
Describe the primary categories of smells and the concept of odor blindness.
Explain the structure and location of the olfactory membrane and mucosa, including the types and roles of cells involved in olfaction.
Describe the pathway and mechanisms of olfactory signal transmission from the olfactory receptors to the brain.
Illustrate the biochemical cascade triggered by odorant binding to olfactory receptors, including the role of G-proteins and second messengers in generating an action potential.
Identify different types of olfactory disorders such as anosmia, hyposmia, hyperosmia, and dysosmia, including their potential causes.
Key Topics:
Olfactory Genes:
3% of the human genome accounts for olfactory genes.
400 genes for odorant receptors.
Olfactory Membrane:
Located in the superior part of the nasal cavity.
Medially: Folds downward along the superior septum.
Laterally: Folds over the superior turbinate and upper surface of the middle turbinate.
Total surface area: 5-10 square centimeters.
Olfactory Mucosa:
Olfactory Cells: Bipolar nerve cells derived from the CNS (100 million), with 4-25 olfactory cilia per cell.
Sustentacular Cells: Produce mucus and maintain ionic and molecular environment.
Basal Cells: Replace worn-out olfactory cells with an average lifespan of 1-2 months.
Bowman’s Gland: Secretes mucus.
Stimulation of Olfactory Cells:
Odorant dissolves in mucus and attaches to receptors on olfactory cilia.
Involves a cascade effect through G-proteins and second messengers, leading to depolarization and action potential generation in the olfactory nerve.
Quality of a Good Odorant:
Small (3-20 Carbon atoms), volatile, water-soluble, and lipid-soluble.
Facilitated by odorant-binding proteins in mucus.
Membrane Potential and Action Potential:
Resting membrane potential: -55mV.
Action potential frequency in the olfactory nerve increases with odorant strength.
Adaptation Towards the Sense of Smell:
Rapid adaptation within the first second, with further slow adaptation.
Psychological adaptation greater than receptor adaptation, involving feedback inhibition from the central nervous system.
Primary Sensations of Smell:
Camphoraceous, Musky, Floral, Pepperminty, Ethereal, Pungent, Putrid.
Odor Detection Threshold:
Examples: Hydrogen sulfide (0.0005 ppm), Methyl-mercaptan (0.002 ppm).
Some toxic substances are odorless at lethal concentrations.
Characteristics of Smell:
Odor blindness for single substances due to lack of appropriate receptor protein.
Behavioral and emotional influences of smell.
Transmission of Olfactory Signals:
From olfactory cells to glomeruli in the olfactory bulb, involving lateral inhibition.
Primitive, less old, and new olfactory systems with different path
263778731218 Abortion Clinic /Pills In Harare ,sisternakatoto
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- Video recording of this lecture in English language: https://youtu.be/lK81BzxMqdo
- Video recording of this lecture in Arabic language: https://youtu.be/Ve4P0COk9OI
- Link to download the book free: https://nephrotube.blogspot.com/p/nephrotube-nephrology-books.html
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Pulmonary Thromboembolism - etilogy, types, medical- Surgical and nursing man...VarunMahajani
Disruption of blood supply to lung alveoli due to blockage of one or more pulmonary blood vessels is called as Pulmonary thromboembolism. In this presentation we will discuss its causes, types and its management in depth.
NVBDCP.pptx Nation vector borne disease control programSapna Thakur
NVBDCP was launched in 2003-2004 . Vector-Borne Disease: Disease that results from an infection transmitted to humans and other animals by blood-feeding arthropods, such as mosquitoes, ticks, and fleas. Examples of vector-borne diseases include Dengue fever, West Nile Virus, Lyme disease, and malaria.
Flu Vaccine Alert in Bangalore Karnatakaaddon Scans
As flu season approaches, health officials in Bangalore, Karnataka, are urging residents to get their flu vaccinations. The seasonal flu, while common, can lead to severe health complications, particularly for vulnerable populations such as young children, the elderly, and those with underlying health conditions.
Dr. Vidisha Kumari, a leading epidemiologist in Bangalore, emphasizes the importance of getting vaccinated. "The flu vaccine is our best defense against the influenza virus. It not only protects individuals but also helps prevent the spread of the virus in our communities," he says.
This year, the flu season is expected to coincide with a potential increase in other respiratory illnesses. The Karnataka Health Department has launched an awareness campaign highlighting the significance of flu vaccinations. They have set up multiple vaccination centers across Bangalore, making it convenient for residents to receive their shots.
To encourage widespread vaccination, the government is also collaborating with local schools, workplaces, and community centers to facilitate vaccination drives. Special attention is being given to ensuring that the vaccine is accessible to all, including marginalized communities who may have limited access to healthcare.
Residents are reminded that the flu vaccine is safe and effective. Common side effects are mild and may include soreness at the injection site, mild fever, or muscle aches. These side effects are generally short-lived and far less severe than the flu itself.
Healthcare providers are also stressing the importance of continuing COVID-19 precautions. Wearing masks, practicing good hand hygiene, and maintaining social distancing are still crucial, especially in crowded places.
Protect yourself and your loved ones by getting vaccinated. Together, we can help keep Bangalore healthy and safe this flu season. For more information on vaccination centers and schedules, residents can visit the Karnataka Health Department’s official website or follow their social media pages.
Stay informed, stay safe, and get your flu shot today!
New Drug Discovery and Development .....NEHA GUPTA
The "New Drug Discovery and Development" process involves the identification, design, testing, and manufacturing of novel pharmaceutical compounds with the aim of introducing new and improved treatments for various medical conditions. This comprehensive endeavor encompasses various stages, including target identification, preclinical studies, clinical trials, regulatory approval, and post-market surveillance. It involves multidisciplinary collaboration among scientists, researchers, clinicians, regulatory experts, and pharmaceutical companies to bring innovative therapies to market and address unmet medical needs.
Explore natural remedies for syphilis treatment in Singapore. Discover alternative therapies, herbal remedies, and lifestyle changes that may complement conventional treatments. Learn about holistic approaches to managing syphilis symptoms and supporting overall health.
Recomendações da OMS sobre cuidados maternos e neonatais para uma experiência pós-natal positiva.
Em consonância com os ODS – Objetivos do Desenvolvimento Sustentável e a Estratégia Global para a Saúde das Mulheres, Crianças e Adolescentes, e aplicando uma abordagem baseada nos direitos humanos, os esforços de cuidados pós-natais devem expandir-se para além da cobertura e da simples sobrevivência, de modo a incluir cuidados de qualidade.
Estas diretrizes visam melhorar a qualidade dos cuidados pós-natais essenciais e de rotina prestados às mulheres e aos recém-nascidos, com o objetivo final de melhorar a saúde e o bem-estar materno e neonatal.
Uma “experiência pós-natal positiva” é um resultado importante para todas as mulheres que dão à luz e para os seus recém-nascidos, estabelecendo as bases para a melhoria da saúde e do bem-estar a curto e longo prazo. Uma experiência pós-natal positiva é definida como aquela em que as mulheres, pessoas que gestam, os recém-nascidos, os casais, os pais, os cuidadores e as famílias recebem informação consistente, garantia e apoio de profissionais de saúde motivados; e onde um sistema de saúde flexível e com recursos reconheça as necessidades das mulheres e dos bebês e respeite o seu contexto cultural.
Estas diretrizes consolidadas apresentam algumas recomendações novas e já bem fundamentadas sobre cuidados pós-natais de rotina para mulheres e neonatos que recebem cuidados no pós-parto em unidades de saúde ou na comunidade, independentemente dos recursos disponíveis.
É fornecido um conjunto abrangente de recomendações para cuidados durante o período puerperal, com ênfase nos cuidados essenciais que todas as mulheres e recém-nascidos devem receber, e com a devida atenção à qualidade dos cuidados; isto é, a entrega e a experiência do cuidado recebido. Estas diretrizes atualizam e ampliam as recomendações da OMS de 2014 sobre cuidados pós-natais da mãe e do recém-nascido e complementam as atuais diretrizes da OMS sobre a gestão de complicações pós-natais.
O estabelecimento da amamentação e o manejo das principais intercorrências é contemplada.
Recomendamos muito.
Vamos discutir essas recomendações no nosso curso de pós-graduação em Aleitamento no Instituto Ciclos.
Esta publicação só está disponível em inglês até o momento.
Prof. Marcus Renato de Carvalho
www.agostodourado.com
The prostate is an exocrine gland of the male mammalian reproductive system
It is a walnut-sized gland that forms part of the male reproductive system and is located in front of the rectum and just below the urinary bladder
Function is to store and secrete a clear, slightly alkaline fluid that constitutes 10-30% of the volume of the seminal fluid that along with the spermatozoa, constitutes semen
A healthy human prostate measures (4cm-vertical, by 3cm-horizontal, 2cm ant-post ).
It surrounds the urethra just below the urinary bladder. It has anterior, median, posterior and two lateral lobes
It’s work is regulated by androgens which are responsible for male sex characteristics
Generalised disease of the prostate due to hormonal derangement which leads to non malignant enlargement of the gland (increase in the number of epithelial cells and stromal tissue)to cause compression of the urethra leading to symptoms (LUTS
New Directions in Targeted Therapeutic Approaches for Older Adults With Mantl...i3 Health
i3 Health is pleased to make the speaker slides from this activity available for use as a non-accredited self-study or teaching resource.
This slide deck presented by Dr. Kami Maddocks, Professor-Clinical in the Division of Hematology and
Associate Division Director for Ambulatory Operations
The Ohio State University Comprehensive Cancer Center, will provide insight into new directions in targeted therapeutic approaches for older adults with mantle cell lymphoma.
STATEMENT OF NEED
Mantle cell lymphoma (MCL) is a rare, aggressive B-cell non-Hodgkin lymphoma (NHL) accounting for 5% to 7% of all lymphomas. Its prognosis ranges from indolent disease that does not require treatment for years to very aggressive disease, which is associated with poor survival (Silkenstedt et al, 2021). Typically, MCL is diagnosed at advanced stage and in older patients who cannot tolerate intensive therapy (NCCN, 2022). Although recent advances have slightly increased remission rates, recurrence and relapse remain very common, leading to a median overall survival between 3 and 6 years (LLS, 2021). Though there are several effective options, progress is still needed towards establishing an accepted frontline approach for MCL (Castellino et al, 2022). Treatment selection and management of MCL are complicated by the heterogeneity of prognosis, advanced age and comorbidities of patients, and lack of an established standard approach for treatment, making it vital that clinicians be familiar with the latest research and advances in this area. In this activity chaired by Michael Wang, MD, Professor in the Department of Lymphoma & Myeloma at MD Anderson Cancer Center, expert faculty will discuss prognostic factors informing treatment, the promising results of recent trials in new therapeutic approaches, and the implications of treatment resistance in therapeutic selection for MCL.
Target Audience
Hematology/oncology fellows, attending faculty, and other health care professionals involved in the treatment of patients with mantle cell lymphoma (MCL).
Learning Objectives
1.) Identify clinical and biological prognostic factors that can guide treatment decision making for older adults with MCL
2.) Evaluate emerging data on targeted therapeutic approaches for treatment-naive and relapsed/refractory MCL and their applicability to older adults
3.) Assess mechanisms of resistance to targeted therapies for MCL and their implications for treatment selection
micro teaching on communication m.sc nursing.pdfAnurag Sharma
Microteaching is a unique model of practice teaching. It is a viable instrument for the. desired change in the teaching behavior or the behavior potential which, in specified types of real. classroom situations, tends to facilitate the achievement of specified types of objectives.
1. Eye Histo lo gy
Assoc. Prof. Dr. Karim Al-Jashamy
2. -The superior and inferior tarsal
plates are dense fibrous plates
that give support and form to the
eyelids. Tarsal glands produce oily
secretions to prevent tears from
leaking out, while the eyelids stay
dry.
- The obicularis oculi muscle
contains both palpebral and orbital
parts and acts to close the eyelids.
- The levator palpebrae superioris
muscle elevates the upper eyelid.
It is a skeletal muscle under
voluntary control.
3. The eye
• A complex and highly developed
photosensitive organ that permits an
accurate analysis of the form, light
intensity, and color reflected from
objects.
• Each eye is composed of three
concentric layers: an external layer
that consists of the sclera and the
cornea; a middle layer also called the
vascular layer consisting of the
choroid, ciliary body, and iris; and an
inner layer of nerve tissue, the retina,
which consists of an outer pigment
epithelium and an inner retina
proper.
• The photosensitive retina proper is
part of the central nervous system
and communicates with the
cerebrum through the optic nerve
and extends forward to the ora
serrata.
4. Diagram, showing the structure of the eye, retina, fovea, and ciliary body.
An enlarged diagram of the fovea is shown at the lower right: (1) axons of
ganglion cells; (2) bipolar cells; (3) rods; (4) cones. Enlarged diagrams of the
ciliary body (upper right) and retina (lower left)
5. •The sclera consists of tough,
dense connective tissue made up
mainly of flat collagen bundles
intersecting in various directions while
remaining parallel to the surface of the
organ, a moderate amount of ground
substance, and a few fibroblasts.
•The external surface of the sclera the
episclera is connected by a loose
system of thin collagen fibers to a dense
layer of connective tissue called
Tenon's capsule. Tenon's capsule
comes into contact with the loose
conjunctival stroma at the junction of the
cornea with the sclera.
• Between the sclera and the choroid is Section of choroid and sclera. The choroid is a
highly vascular layer (arrowheads) of
the suprachoroidal lamina, a thin layer
connective tissue containing melanocytes that
of loose connective tissue rich in prevent the reflection of incident light.
melanocytes, fibroblasts, and elastic The sclera is a dense layer of connective
fibers. tissue rich in fibers of collagen type I,
arranged in parallel bundles.
6. • The outer layer, or sclera,
consists of dense fibrous
connective tissue.
– The sclera is "white" of the eye.
– The sclera is continuous with the
transparent substantia propria of the
cornea.
– The exposed front surface of the eye,
including the cornea, is also covered
by a thin, non-keratinized stratified
squamous epithelium.
1 - cornea
2 - iris
3 - posterior chamber of the eye
4 - lens
5 - vitreous body
6 - ciliary body
7 - retina
8 - choroid
9 - sclera
10 - canal of Sclemm
11 - growth area of the lens
12 - anterior epithelium of the lens
9. • Cornea
• colorless and transparent.
• A transverse section of the cornea
shows that it consists of five layers:
epithelium, Bowman's membrane,
stroma, Descemet's membrane, and
endothelium.
• The corneal epithelium is stratified,
squamous, and nonkeratinized and
consists of five or six layers of cells.
• In the basal part of the epithelium are
numerous mitotic figures that are
responsible for the cornea's remarkable
regenerative capacity
• The surface corneal cells show
microvilli protruding into the space
filled by the precorneal tear film.
• This epithelial tissue is covered by a
protective layer of lipid and
glycoprotein, about 7 m thick. The
cornea has one of the richest sensory
nerve supplies of any eye tissue.
11. • This layer, Bowman's membrane, consists of collagen fibers crossing at random,
a condensation of the intercellular substance, and no cells . Bowman's membrane
contributes greatly to the stability and strength of the cornea.
• The stroma is formed of many layers of parallel collagen bundles that cross at
approximately right angles to each other. The collagen fibrils within each lamella
are parallel to each other and run the full width of the cornea. Between the several
layers, the cytoplasmic extensions of fibroblasts are flattened like the wings of a
butterfly.
• Descemet's membrane is a thick homogeneous structure composed of fine
collagenous filaments organized in a three-dimensional network.
• The endothelium of the cornea is a simple squamous epithelium. These cells
possess organelles for secretion that are characteristic of cells engaged in active
transport and protein synthesis and that may be related to the synthesis and
maintenance of Descemet's membrane.
• The corneal endothelium and epithelium are responsible for maintaining the
transparency of the cornea. Both layers are capable of transporting sodium ions
toward their apical surfaces. Chloride ions and water follow passively, maintaining
the corneal stroma in a relatively dehydrated state. This state, along with the
regular orientation of the very thin collagen fibrils of the stroma, accounts for the
transparency of the cornea.
12. • The corneoscleral junction, or limbus, is an area of transition from
the transparent collagen bundles of the cornea to the white opaque
fibers of the sclera. It is highly vascularized, and its blood vessels
assume an important role in corneal inflammatory processes.
• The cornea, an avascular structure, receives its metabolites by
diffusion from adjacent vessels and from the fluid of the anterior
chamber of the eye.
• In the region of the limbus in the stromal layer, irregular endothelium-
lined channels, the trabecular meshwork, merge to form Schlemm's
canal, which drains fluid from the anterior chamber of the eye.
Schlemm's canal communicates externally with the venous system.
• Middle, or Vascular, Layer
• The middle (vascular) layer of the eye consists of three parts: choroid,
ciliary body, and iris, known collectively as the uveal tract.
13. - The ciliary body contains ciliary muscle that is composed of smooth muscle. Contraction
and relaxation of the ciliary muscles change the tension of the zonular fibers, or suspensory
ligaments, of the lens. This allows the lens to change shape, a process known as
accommodation.
- The ciliary processes are folds of connective tissue that are covered by two layers of
epithelium. There is also a complex vasculature that cannot be seen easily. Fluid from these
vessels is processed and transported by the epithelial cells to the posterior chamber as
aqueous humor. The epithelial cells constitute the blood-aqueous barrier.
-
14. - The aqueous humor enters the anterior
chamber through the pupil as it flows
between the lens and the iris.
- Aqueous humor leaves the anterior
chamber through the trabecular
meshwork and into the canal of
Schlemm.
- This is an endothelial lines,
circumferentially arranged vessel that
communicates with veins in the sclera
and returns the aqueous humor back to
the general circulation.
- Obstruction of the trabecular meshwork
and canals of Schlemm are thought to
be the major cause of elevated
intraocular pressure, which could then
lead to glaucoma.
15. - The iris is detailed here in higher magnification. Note
the anterior and posterior chambers to help orient
yourself.
- The anterior surface of the iris contains loose, variably
pigmented stroma. It is open to the circulating aqueous
humor within the anterior chamber.
- Two layers of heavily pigmented epithelium cover the
posterior surface of the iris.
- Note that the sphincter pupillae muscle can be easily
seen near the pupil margin. It is smooth muscle
controlled by parasympathetics. The dilator pupillae
muscle is more difficult to identify, but it dilates the pupil
upon sympathetic innervation.
16. Lens
• The lens consists of a
lens capsule, the
subcapsular epithelium
and lens fibres. It does
not contain blood
vessels or nerves.