in this ppt we describe about anatomy of eyeball( cornea, sclera, choroid, iris, retina, ciliary body, vitreous etc..), dimension of the eyeball, coats of the eyeball.
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.
1. Introduction Gross anatomy Layers Blood supply, drainage and nerve supply
2. INTRODUCTION • Sclera forms posterior 5/6th of external tunic , connective tissue coat of eyeball. • it continues with duramater and cornea • Its whole surface covered by tenon’s capsule • Anteriorly covered by- bulbar conjunctiva • Inner surface lies in contact with choroid • With a potential suprachoroidal space in between
3. Equa THICKNESS OF SCLERA
4. • Thickness varies with individual, with age • Thinner- children, elder, F> M • Thickest posteriorly • Gradually becomes thinner when traced anteriorly • Thin at insertion of extraocular muscle
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.
1. Introduction Gross anatomy Layers Blood supply, drainage and nerve supply
2. INTRODUCTION • Sclera forms posterior 5/6th of external tunic , connective tissue coat of eyeball. • it continues with duramater and cornea • Its whole surface covered by tenon’s capsule • Anteriorly covered by- bulbar conjunctiva • Inner surface lies in contact with choroid • With a potential suprachoroidal space in between
3. Equa THICKNESS OF SCLERA
4. • Thickness varies with individual, with age • Thinner- children, elder, F> M • Thickest posteriorly • Gradually becomes thinner when traced anteriorly • Thin at insertion of extraocular muscle
Each eyelid contains a fibrous plate, called a tarsus, that gives it structure and shape; muscles, which move the eyelids; and meibomian (or tarsal) glands, which secrete lubricating fluids. The lids are covered with skin, lined with mucous membrane, and bordered with a fringe of hairs, the eyelashes.
The orbit is a four-sided pyramidal socket in the skull in which the eye and its appendages are situated. "Orbit" can refer to the bony socket, or it can also be used to imply the contents.
The orbital contents comprise the eye, the orbital and retrobulbar fascia, extraocular muscles, cranial nerves II, III, IV, V, and VI, blood vessels, fat, the lacrimal gland with its sac and nasolacrimal duct, the eyelids, medial and lateral palpebral ligaments, check ligaments, the suspensory ligament, septum, ciliary ganglion and short ciliary nerves.
Cornea is the clear front surface of the eye. It lies directly in front of the iris and pupil, and it allows light to enter the eye.
Cornea forms the transparent and anterior 1/6th of the external fibrous coat of the globe of the eyeball.
The cornea is the eye's most powerful structure for focusing light that provides approximately 65 to 75 percent of the focusing power of the eye.
The cornea has unmyelinated nerve endings sensitive to touch, temperature and chemicals; a touch of the cornea causes an involuntary reflex to close the eyelid.
structure of eye ball,eyeball is a specialized sense organ that helps us to understand our environment. It is a sensory unit composed of three parts: receptor, sensory pathway, and a brain center
The main parts of the human eye are The Conjunctiva,
Sclera,Choroid,
Cornea, Iris, Pupil,
Anterior Chamber,
Posterior Chamber, Aqueous humor, Lens, Vitreous humor, Retina,Macula and Optic nerve.
1-IT IS A MIDDLE VASCULAR COAT OF EYEBALL.
2-IT MAINLY CONSIST OF THREE PARTS IRIS, CHOROID, CILIARY BODY.
3- CILIARY BODY CAN HOLD THE LENS AND PLAY IMPORTANT ROLE IN ACCOMODATION.
Each eyelid contains a fibrous plate, called a tarsus, that gives it structure and shape; muscles, which move the eyelids; and meibomian (or tarsal) glands, which secrete lubricating fluids. The lids are covered with skin, lined with mucous membrane, and bordered with a fringe of hairs, the eyelashes.
The orbit is a four-sided pyramidal socket in the skull in which the eye and its appendages are situated. "Orbit" can refer to the bony socket, or it can also be used to imply the contents.
The orbital contents comprise the eye, the orbital and retrobulbar fascia, extraocular muscles, cranial nerves II, III, IV, V, and VI, blood vessels, fat, the lacrimal gland with its sac and nasolacrimal duct, the eyelids, medial and lateral palpebral ligaments, check ligaments, the suspensory ligament, septum, ciliary ganglion and short ciliary nerves.
Cornea is the clear front surface of the eye. It lies directly in front of the iris and pupil, and it allows light to enter the eye.
Cornea forms the transparent and anterior 1/6th of the external fibrous coat of the globe of the eyeball.
The cornea is the eye's most powerful structure for focusing light that provides approximately 65 to 75 percent of the focusing power of the eye.
The cornea has unmyelinated nerve endings sensitive to touch, temperature and chemicals; a touch of the cornea causes an involuntary reflex to close the eyelid.
structure of eye ball,eyeball is a specialized sense organ that helps us to understand our environment. It is a sensory unit composed of three parts: receptor, sensory pathway, and a brain center
The main parts of the human eye are The Conjunctiva,
Sclera,Choroid,
Cornea, Iris, Pupil,
Anterior Chamber,
Posterior Chamber, Aqueous humor, Lens, Vitreous humor, Retina,Macula and Optic nerve.
1-IT IS A MIDDLE VASCULAR COAT OF EYEBALL.
2-IT MAINLY CONSIST OF THREE PARTS IRIS, CHOROID, CILIARY BODY.
3- CILIARY BODY CAN HOLD THE LENS AND PLAY IMPORTANT ROLE IN ACCOMODATION.
It describe the anatomy of eye in detail according to the BD chaurasia textbook.
It includes the parts of eye, internal structures, blood and nerve supply.
This is an educational presentation on Anatomy of Eyeball. This presentation includes different layers of eyeball with their blood and nerve supply.
Here, is a link of a presentation on contents of orbit-
https://www.slideshare.net/AyshahHashimi1/contents-of-orbit
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2. • Whole eye is called eyeball.
• Shape – oblate spheroid
Dimension of an adult eyeball-
• Anterioposterior diameter – 24mm
• Horizontal diameter – 23.5mm
• Vertical diameter – 23mm
• Circumference – 75mm
• Volume – 6.5mm
• Weight – 7gm
• Refractive power +60D
EYEBALL
Anterior pole Posterior pole
3. Coats of the eyeball
• The eyeball consist of three coats –
I. Fibrous coat – cornea and sclera.
II. Vascular coat – iris, ciliary body and
choroid.
III. Nervous coat – retina.
4. Cornea
• Cornea is transparent, avascular,
watch glass like structure.
• It refract the light rays.
• Cornea contributes two-third of the
refractive power.
• It protect the internal structure of the
eye.
• Refractive power of the cornea is
+43.
5. Sclera
• The sclera forms the posterior 5/6
opaque part of the external fibrous
tunic of the eyeball.
• Its whole outer surface cover by
the tenon’s capsule.
• It help in maintain your eyeball
shape and protect from injury.
• It also attached to the extraocular
muscles.
6. Iris
• Iris is the colored part of the eye.
• Iris is the anterior most part of the
uveal tract.
• It is circular disk corresponding to the
diaphragm of a camera.
• In its center is an aperture of about
4mm called pupil which regulates the
amount of light reaching the retina.
7. Ciliary body
• Forword continuation of choroid at ora
serrata.
• It contains ciliary muscle and ciliary
processes.
• The ciliary process produce aqueous
humor .
• The ciliary muscle take part
accommodation.
8. Choroid
• Posterior part of the vascular coat of
the eyeball.
• This layer contains many blood
vessels.
• Extended from optic disc to ciliary
body.(ors serrata)
• The choroid provides nourishment
and oxygen to the outer layer of the
retina.
9. Crystalline Lens
• Lens is a transparent, biconvex,
crystalline structure.
• Lens lies between posterior surface
of the iris and and anterior surface
of the vitreous.
• It converge the light rays and focus
on retina.
• Refractive power of the crystalline
lens is +17D.
10. Vitreous Humour
• Vitreous humours is an inert, transparent,
jelly like structure that fill the posterior 80% of
the cavity of the eyeball.
• It is about 4ml in volume and 4gm in weight.
• It maintain the shape of the eyeball.
• It provide nutrition to the eye.
• Optical function.
11. Retina
• Retina is the innermost tunic of the eyeball
• It is transparent, thin, and delicate
membrane.
• It is highly developed tissue of the eye.
• The retina converts light that enters into the
eye into electrical signal and send to the
brain.