Anatomy of lacrimal apparatus
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The lacrimal apparatus consists of the main lacrimal gland, accessory lacrimal glands, and lacrimal passages including the puncta, canaliculi, lacrimal sac, and nasolacrimal duct. The main lacrimal gland has orbital and palpebral parts that secrete tears via ducts opening into the superior fornix. Accessory glands include Krause's and Wolfring's glands. Tears drain from the puncta through the canaliculi and lacrimal sac into the nasolacrimal duct, lubricating the eye and washing away debris. Disorders can include dry eye, hyperlacrimation, epiphora, and dacryocyst
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anatomy of eyes , ocular structure , sclera , choroid , retina ,eyeball, parts of eyes ,ocular anatomy, ocular physiology
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lacrimal sys -1.pdf
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The document describes the anatomy and physiology of the lacrimal apparatus. It discusses the following key points:
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Anatomy of the lacrimal apparatus
The lacrimal apparatus consists of the lacrimal gland, lacrimal drainage system, and associated structures that produce and drain tears from the eye.
The lacrimal gland develops from surface ectoderm and is located above and lateral to the eye. Tears produced by the gland drain through puncta and canaliculi into the lacrimal sac, then through the nasolacrimal duct into the nose.
The lacrimal sac is lodged in the lacrimal fossa of the medial orbital wall. It connects to the nasolacrimal duct, which courses posteriorly and laterally through bone to drain into the nasal cavity. Coordinated blinking and pressure differences aid
Anatomy of the lacrimal apparatus sivateja
The lacrimal apparatus consists of the lacrimal gland, lacrimal drainage system, and associated structures that produce and drain tears from the eye.
The lacrimal gland develops from surface ectoderm and consists of an orbital and palpebral part. Tears are secreted into the superior fornix via 10-12 lacrimal ducts. The tears then drain through the puncta, canaliculi, lacrimal sac, and nasolacrimal duct into the nasal cavity.
The lacrimal sac is located in the lacrimal fossa and connects to the nasolacrimal duct, which courses through the nasolacrimal canal before opening into the inferior
anatomy and physiology of lacrimal apparatus ppt
This document summarizes key aspects of the lacrimal system including its embryology, anatomy, physiology and role in tear formation and drainage. It discusses the lacrimal gland, canaliculi, lacrimal sac, nasolacrimal duct and meibomian glands. It also describes the layers of the tear film - glycocalyx, mucous, aqueous and lipid layers - and their functions in lubricating and protecting the eye. The document is a comprehensive overview of the lacrimal system and tear film.
Anatomy-and-Physiology-of-Lacrimal-System.pdf
The document describes the anatomy and physiology of the lacrimal system. It discusses the layers of tears, the glands that secrete tears including the main lacrimal gland and accessory glands, and the drainage components including the puncta, canaliculi, lacrimal sac, and nasolacrimal duct that drain tears into the nasal cavity. The lacrimal system works to produce tears, distribute them across the eye, and drain any excess tears to keep the surface of the eye moist and protected.
anatomy And Physiology of lacrimal secretions
Diagnosis, Management, and Surgery by Adam J. Cohen, Michael Mercandetti & Brian G. Brazzo. The dry eye , a practical approach by Sudi Patel & Kenny J Blades. Jack J Kanski’s clinical ophthalmology Clinical Anatomy of the Eye by Richard S. Snell & Michael A. Lemp.
3. It is concerned with the tear formation & transport. Lacrimal passage includes : Lacrimal gland Conjunctival sac Lacrimal puncta Lacrimal canaliculi Lacrimal sac Nasolacrimal duct
4. The following components of the lacrimal apparatus are discussed : Embryology Osteology Secretory system Excretory system Physiology
5. Ectodermal origin Solid epithelial buds(first 2 months) Supero
lacrimal app.pptx
This document describes the anatomy and structure of the lacrimal apparatus, which produces and drains tears from the eyes. It includes the main lacrimal gland located in the orbit, accessory lacrimal glands in the eyelid, and the lacrimal drainage system consisting of puncta, canaliculi, lacrimal sac, and nasolacrimal duct leading to the nose. The main lacrimal gland is a serous gland made of acini and ducts and receives blood supply from the lacrimal artery and drains to the ophthalmic vein. Tears produced drain through puncta and canaliculi into the lacrimal sac then through the nasolacrimal duct to
Lacrimal Apparatus.pptx
The document describes the lacrimal apparatus, which produces and transports tears. It includes the main lacrimal gland, accessory glands, puncta, canaliculi, lacrimal sac, and nasolacrimal duct. The main lacrimal gland secretes tears into the puncta, which drain into the canaliculi and lacrimal sac. The nasolacrimal duct then drains tears from the lacrimal sac into the nose. The tear film has three layers - an outer lipid layer from glands, a middle aqueous layer secreted by the lacrimal gland, and an inner mucus layer from goblet cells that converts the cornea to a hydrophilic surface.
Congenital nasolacrimal duct obstruction
Congenital nasolacrimal duct obstruction is a common cause of tearing in infants, where the nasolacrimal duct fails to fully canalize after birth. Signs include tearing and eye discharge, especially with colds. Treatment first involves massage and antibiotics, with probing of the duct under anesthesia if not resolved by 12-18 months. Probing has a high success rate when done early. Surgery like dacryocystorhinostomy may be needed if probing fails or for membranous obstructions. The procedure involves creating a passage from the lacrimal sac to the nasal cavity with good long-term success rates over 90% typically.
anatomyoflacrimalapparatus-.pptx invludin
This document summarizes the anatomy and physiology of the lacrimal apparatus. It describes the main structures involved, including the lacrimal gland, puncta, canaliculi, lacrimal sac, and nasolacrimal duct. It discusses the blood supply, nerve supply, and secretory function of the lacrimal gland. Causes of watering eyes such as hyperlacrimation and epiphora are also outlined.
Anatomyoflacrimalapparatus 160313074220
This document summarizes the anatomy and examination of the lacrimal apparatus system. It describes the main structures including the lacrimal gland, puncta, canaliculi, lacrimal sac, and nasolacrimal duct. It then discusses the clinical evaluation of a "watering eye" case through slit lamp examination, the regurgitation on pressure over lacrimal apparatus system test, fluorescein dye disappearance test, diagnostic probing, and syringing. The document aims to provide an overview of the lacrimal drainage system and methods for examining obstructions.
Anatomy of lacrimal apparatus
The lacrimal apparatus consists of the lacrimal glands, lacrimal passages, and associated structures that produce and drain tears from the eye. The main lacrimal gland sits in the lacrimal fossa and drains into the superior fornix through 10-12 ducts. Tears are drained from the eye through the puncta into the canaliculi and lacrimal sac, then through the nasolacrimal duct into the nose. Contraction of the orbicularis muscle aids in drainage through the lacrimal pump mechanism.
Lacrimal apparatus
The document summarizes the anatomy and function of the lacrimal apparatus. It consists of the lacrimal glands, lacrimal passages including the puncta, canaliculi, lacrimal sac, and nasolacrimal duct. Tears are produced by the lacrimal glands and drained through the lacrimal passages and nasolacrimal duct into the nasal cavity, powered by the lacrimal pump with each blink. The lacrimal apparatus continuously produces and eliminates tears to keep the eye surface lubricated.
Lacrimal Apparatus: Different structure, Tear Film and Lacrimal Pump
This is a presentation made for bachelor entrance preparation students.
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Mero, Eye Meroeye, Optometry, Optometrist, VisionScience, EyeCarePractisners, Eye talks, Webinar, OptometryStudents, EyeDoctors, EyeHealth, EyeCare, Learning, Academy, education, YoungOptometrists, OptometryLibrary, OptometryJournal, OptometryMagazine, AOE, virtual conference, advancingOptometryEducation
Anatomy and Physiology of Lacrimal system
The document provides information on the anatomy and physiology of the lacrimal system and lacrimal drainage pathway. It describes the development, structure, blood supply, innervation and functions of the lacrimal glands, lacrimal puncta, canaliculi, lacrimal sac, and nasolacrimal duct. It also discusses the physiology of tear drainage via the Rosengren-Doane pump mechanism and clinical tests like the Jones dye test, fluorescein dye disappearance test, and lacrimal syringing test that are used to evaluate the lacrimal drainage pathway.
Anatomy and physiology of lacrimal system
This document provides an overview of the anatomy and physiology of the lacrimal system. It describes the secretory apparatus including the lacrimal gland and accessory glands. It then describes the excretory apparatus including the puncta, canaliculi, lacrimal sac, and nasolacrimal duct. It discusses the development of both the secretory and excretory systems. It provides details on the main lacrimal gland, lacrimal ducts, accessory lacrimal glands, lacrimal puncta, and canaliculi. It discusses the arterial supply, venous and lymphatic drainage, and nerve supply to the lacrimal gland. It covers the structure, functions, and applied
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Lacrimal Apparatus: Different structure, Tear Film and Lacrimal Pump
Lacrimal Apparatus: Different structure, Tear Film and Lacrimal Pump
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Anatomy of lacrimal apparatus
- 1. 18-10-2015 1
- 2. Lacrimal apparatus Main gland Accessory glands Blood supply and Nerve supply Lacrimal Passages Puncta Canaliculi Sac Nasolacrimal duct Tear film Functions of tear film Lacrimal pump mechanism18-10-2015 2
- 3. The lacrimal apparatus comprises Main lacrimal gland Accessory lacrimal glands Lacrimal passages, which include : ▪ Puncta ▪ Canaliculi ▪ Lacrimal Sac ▪ Nasolacrimal Duct (NLD) 18-10-2015 3
- 4. Orbital Part: About the size and shape of a small almond Situated in the lacrimal fossa on the frontal bone, at the outer part of the orbital plate The superior surface is convex and lies in contact with the bone The inferior surface is concave and lies on the levator palpebrae superioris (LPS )muscle 10-12 ducts pass downward from the gland and open into the lateral part if the superior fornix 18-10-2015 4
- 5. Palpebral Part : It is small and consists only of 1-2 lobules It is situated in the course of the ducts of the orbital part Posteriorly it is continuous with the orbital part 18-10-2015 5
- 6. Glands of Krause : They are microscopic groups of acini that lie beneath the palpebral conjunctiva between the fornix and the edge of the tarsus There are about 42 in the upper fornix and 6-8 in the lower fornix The ducts of numerous acini unite to form a larger duct that open into the fornix Glands of Wolfring : These are present near the upper border of the superior tarsal plate and along the lower border of the inferior tarsus 18-10-2015 6
- 7. Structure : All glands are made up of serous acini and ducts, connective tissue and puncta 18-10-2015 7
- 8. Blood Supply : Main gland is supplied by lacrimal artery, a branch of ophthalmic artery Nerve Supply: Sensory supply : Lacrimal nerve Sympathetic supply : Carotid plexus of cervical sympathetic chain Secretomotor fibres 18-10-2015 8
- 9. 18-10-2015 9
- 10. Two small rounded or oval openings, on the upper and lower lids, about 6 and 6.5 mm respectively, temporal to the inner canthus Each punctum is situation on a slight elevation called lacrimal papilla Normally, puncta dip into lacus lacrimalis 18-10-2015 10
- 11. Each canaliculus has two parts : vertical (1- 2mm) and horizontal (6-8mm) which lie at right angles to each other Horizontal canaliculi open either separately or join together and open into the lacrimal sac Fold of mucosa at this point forms theValve of Rosenmuller which prevents reflux of tears 18-10-2015 11
- 12. Lies in lacrimal fossa which is formed by lacrimal bone and frontal process of maxilla When sac is distended, it measures 12-15mm vertically and 5-6mm horizontally Fundus extends slightly beyond medial palpebral ligament and sac itself is surrounded by fibres of the orbicularis muscle 18-10-2015 12
- 13. Extends from neck of sac to inferior meatus of the nose It is about 15-18mm long, and lies in a bony canal formed by maxilla and inferior turbinate Direction is downwards, backwards and laterally Surface marking : Line joining inner canthus to ala of nose Mucous lining forms an imperfectValve of Hasner at the lower end of the duct and prevents reflux from the nose 18-10-2015 13
- 14. Structure of fluid covering the cornea : Mucus Layer Aqueous layer Lipid or Oily Layer 18-10-2015 14
- 15. Keeps cornea and conjunctiva moist Provides oxygen to conjunctival epithelium Washes away debris and noxious irritants Prevents infection due to presence of antibacterial substances Facilitates movement of lids over the globe 18-10-2015 15
- 16. 18-10-2015 16
- 17. Dry eye or Keratoconjunctivitis Sicca (KCS) due to lacrimal gland deficiencies or obstructions Hyperlacrimation due to tumors or cysts of the lacrimal gland, or the effect of strong parasympathomimetic drugs Epiphora due to pump failure or obstructions Dacryocytitis due to blockage or infection In atonia of the sac tears aren’t drained through lacrimal passages, in spite of anatomical patency, leading to epiphora 18-10-2015 17
- 18. Parsons’ Diseases of the Eye; 21st Edition; Editors : Ramanjit Sihota, RadhikaTandon; Elsevier A K Khurana : Comprehensive Ophthalmology; Fifth Edition; New Age International Publishers 18-10-2015 18
- 19. 18-10-2015 19