lecture 10

Question 1

The eyeball is embedded in orbital fat, separated from it by a thin fascial sheath

Answer 1

(capsule of Tenon)

Question 2

The anterior pole is the center of the anterior _____ curvature

Answer 2

(corneal)

Question 3

the posterior pole the center of its posterior _____

curvature; a line joining these two points forms the optic axis

Answer 3

(scleral)

Question 4

The two eyelids are united at their extremities, and when parted an elliptical space, the

Answer 4

palpebral fissure

Question 5

The ends of the fissure are termed the

Answer 5

angles or canthi of the eye

Question 6

consisting of the sclera behind and the cornea in front

Answer 6

fibrous tunic

Question 7

vascular, pigmental tunic comprising from behind forwards the (3)

Answer 7

choroid, ciliary body and iris,

Question 8

A neural layer,

Answer 8

the retina

Question 9

Fibrous layer(3)

Answer 9

Sclera
Cornea
Scleral venous sinus (canal of Schlemm)

Question 10

also provides attachments to the extraocular muscles which rotate the eye. Posteriorly, the sclera is pierced by the optic nerve and is continuous with the nerve’s fibrous sheath and hence with the dura mater.

Answer 10

scleral layer

Question 11

is an avascular structure, it is the anterior, projecting transparent part of the external tunic and its convex anteriorly and the major site of refraction of light entering the eye.

Answer 11

cornea

Question 12

covers the internal scleral surface, extending forwards to the ora serrata. It is a thin, highly vascular, dark brown tissue which lines almost the posterior five-sixths of the eye.

Answer 12

choroid

Question 13

continues from the anterior edge of the choroid to the circumference of the iris. It is concerned with the suspension of the lens, accommodation and production of the aqueous fluid for the anterior segment of the eye.

Answer 13

ciliary body

Question 14

is a circular diaphragm behind the cornea, presenting an almost central aperture, the pupil.

Answer 14

iris

Question 15

bounder between the posterior surface of the cornea and the anterior surface of the iris and lens.

Answer 15

anterior chamber

Question 16

formed between the posterior surface of the iris and the anterior surface of the lens and zonular fibers.

Answer 16

posterior chamber:

Question 17

It is hollowed in front as a deep concavity, the _____ , which is adapted to the lens.

Answer 17

hyaloid fossa

Question 18

Accommodation for near vision requires three changes:

Answer 18

Increase in the curvature of the lens.
Constriction of the pupils.
Convergence of the two eyes.

Question 19

Relay information from rods and cones but also relay non-image light information to the body’s biological clock

Answer 19

Ganglion cells