pns

1. THE EYE
‫هلوعا‬ ‫خلق‬ ‫اإلنسان‬ ‫إن‬

2. Cavities of the eyeball
 divided into two large cavities:-
separated by the lens
 1- The anterior cavity:
 containing two chambers
 anterior chamber extends from the
iris to the cornea
 The posterior chamber extending
from the lens to the iris
 The two chambers are continuous
through the pupil
 the anterior cavity contains the
aqueous humor,produced by ciliary
bodies in the posterior chamber
 The aqueous humor will give the
nutritive supply to the avascular
cornea and lens
pupil

3.  2- The posterior cavity:
 contains the vitreous body (vitreous
humor):gel-like material ,not replaced unlike
the aqueous humor
Cavities of the eyeball

4. The lens
 separates ?
 Vascularity ?
 The lens has two unequal curvatures with the
posterior curvature more rounded than the
anterior curvature.
 it’s the only structure in the human body
that continues to grow through out the life

5. `

6. Coats of the eyeball:
 1) The outermost layer, Fibrous layer of the
eyeball (sclera) :
 Most of the sclera is white
 made of dense (tough) irregular connective
tissue that contains elastic and collagen fibers
y sensory and autonomic nerve fibers
 It is the site of attachment of the muscles
involved in eyeball movement.

7.  The facial sheath of the eyeball covers the
surface of the sclera externally.
 from the entrance of the optic nerve to to the
junction between the white sclera and the
cornea (corneo-scleral junction)
Coats of the eyeball:sclera