Anatomy Review- Head Eyes

Front 1

1. How is intraocular pressure maintained?

Back 1

ntraocular pressure is maintained by the drainage of aqueous humor through the scleral venous sinus. IOP keeps the retina smoothly applied to the choroid.
Normal IOP:16 mm Hg.

Front 2

2. What structure divides the anterior and posterior chamber of the eye?

Back 2

The lens

Front 3

3. What is the blood supply of the cornea?

Back 3

Nonvascular

Front 4

4. Where is the vitreous body located and what is its function?

Back 4

Posterior Body
characteristics:
• Jelly-like
• Contributes to IOP

• Prevents the eyeball from collapsing
• Holds the retina flush against internal portions of the eyeball
• Does not undergo constant replacement
• Formed during embryonic life, not replaced thereafter

Front 5

5. Which cranial nerve supplies the majority of the ocular muscles?

Back 5

All muscles of orbit are supplied by CN III, except for the posterior oblique and lateral rectus

Front 6

The eye receptors that enable a person to perceive shades of grey are

(a) cones
(b) rods.

Back 6

(b) Rods

Front 7

. True or false: As a consequence of the crossing of axons in the chiasma, the left optic tract consists of ganglion cell bodies from the lateral half of the retina of the left eye and the medial half of the retina of the right eye.

Back 7

True

Front 8

4. Visual acuity is associated with which cranial nerve?

Back 8

II Optic

Front 9

5. What three cranial nerves are responsible for extraocular muscle function?

Back 9

III, IV, VI
(Oculomotor, Trochlear, abducens)

Front 10

What is the normal value for intraocular pressure?

Back 10

16 mmHg

Front 11

Pupillary constriction and convergence are associated with what cranial nerve?

Back 11

III (Oculomotor)