392
UNIT 3
Organ Systems
I.
Tunica Fibrosa (Tunica Externa)
A. Cornea
1. Pavement epithelium (anterior corneal epithelium)
2. Bowman membrane
3. Corneal stroma (corneal substantia propria)
4. Descemet membrane
5. Endothelium (posterior corneal epithelium)
B. Sclera
1. Episclera (blood vessels and adipose tissue)
2. Sclera proper
II.
Tunica Vasculosa (Tunica Media)
A. Choroid
1. Bruch membrane
2. Choriocapillaris
3. Choroid propria
B. Iris
1. Pigment epithelium
2. Stroma
3. Constrictor pupillae muscle
4. Dilator pupillae muscle
C. Ciliary body
1. Ciliary processes
2. Ciliary epithelium
3. Ciliary muscle
III. Refractive Media of the Eye
A. Lens
(
biconvex, fl
exible, transparent structure
)
1. Lens capsule
2. Subcapsular epithelium
3. Lens f
bers
4. Zonular f
bers
B.
Aqueous humor
(
transparent fl
uid occupying the space
between the lens and cornea
)
C.
Vitreous body
(
refractive gel ±
lling the interior of the
globe posterior to the lens
)
IV.
Retina
(
Tunica Interna
)
A. Fovea
B. Macula
C. Peripheral retina
V. Optic nerve
Pupil
Aqueous
humor
Cerebrospinal
fluid
Central retinal
artery and vein
Optic nerve
Optic disk
(Optic nerve papilla)
Iris
Ciliary processes
Ciliary muscle
Ora serrata
Retina
Choroid
Choroid
Sclera
Sclera
Extraocular muscles
Retina
Ciliary body
Zonular fibers
Anterior chamber
Posterior chamber
Cornea
Macula
Fovea
Lens
Vitreous body
D. Cui
Figure 20-1.
Overview of the eye.
The
yellow dashed line
indicates light coming in and projecting on the
fovea
.
Structures of the Eye
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