Eyeball

Question 1

Eyeball site

Answer 1

Embedded in orbital fat but separated from it by facial sheath called ocular fascia (tenon’s capsule)

Question 2

Ocular fascia site

Answer 2

1. Extends from optic nerve attachment up TO corneoscleral junction
2. It is thickened around medial and lateral recti tendons and attached to corresponding bones of orbit forming medial and lateral check ligaments

Question 3

Suspensory ligament

Answer 3

Fibrous tissue passing between check ligaments
It carries the eyeball

Question 4

Eyeball wall is made of 3 coats

Answer 4

1. Outer coat
2. Middle coat
3. Inner nervous coat (retina)

Question 5

Outer coat contents (2)

Answer 5

1. Cornea
2. Sclera

Question 6

Cornea

Answer 6

Transparent anterior part

Question 7

Sclera

Answer 7

Opaque
Formed by dense white fibrous tissue

Question 8

Middle coat parts posterior to anterior (3)

Answer 8

Vascular and pigmented
1. Choroid
2. Ciliary body
3. Iris

Question 9

Choroid

Answer 9

1. Black membrane
2. Vascular
3. Highly pigmented

Question 10

Ciliary body contents

Answer 10

1. Ciliary ring
2. Ciliary processes
3. Ciliary muscle

Question 11

Ciliary ring

Answer 11

Shows ridges which are radially arranged

Question 12

Ciliary processes

Answer 12

Deep to ciliary muscles and attached to ciliary ring

Question 13

Ciliary muscle

Answer 13

Form muscular ring around iris

Question 14

Ciliary muscle contents

Answer 14

Two parts of smooth muscle fibers

Question 15

Direction of fibers in ciliary muscle

Answer 15

1. Meridional
2. Circular

Question 16

Site of fibers in ciliary muscle

Answer 16

1. Extend from sclera TO ciliary processes
   When muscle contracts, it pulls on the processes so which relaxes suspensory ligament of the lens, lens becomes more convex.

Question 17

Main muscle for accommodation

Answer 17

Ciliary muscle

Question 18

Iris shape and site

Answer 18

1. Circular diaphragm between cornea and lens
2. Perforated at center by pupil
3. Pigmented
4. Contains circular and radial muscle fibers (involuntary)
5. Circular part forms sphincter pupillae
6. Radial part forms dilator pupillae

Question 19

Circular part iris supply

Answer 19

Parasympathetic fibers

Question 20

Radial part iris supply

Answer 20

Sympathetic fibers

Question 21

Anterior chamber of iris

Answer 21

Space between iris and cornea

Question 22

Posterior chamber of iris

Answer 22

Space between iris and lens

Question 23

Inner nervous coat (retina) consists of (2)

Answer 23

1. Outer pigmented part
2. Inner nervous part

Question 24

Optic nerve origin in Inner nervous coat (retina)

Answer 24

Ganglionic layer
Optic nerve then pierces eyeball posterior pole

Question 25

Eyeball cavity contents (3)

Answer 25

1. Aqueous humor
2. Vitreous body
3. Lens

Question 26

Aqueous humor

Answer 26

1. Fluid secreted from vessels of iris and ciliary body
2. Fills anterior and posterior chambers

Question 27

Vitreous body

Answer 27

1. Transparent colorless jelly-like substance filling eyeball posterior 5/6
2. Enveloped by hyaloid membrane

Question 28

Lens

Answer 28

1. Transparent biconvex
2. Situated in between iris (front) and vitreous body (behind)
3. Surrounded by capsule attached to Suspensory ligament of lens keeping it in place

Question 29

Eyeball vessels: arteries (2)

Answer 29

Branches from ophthalmic artery
1. Ciliary artery
2. Central retina artery

Question 30

Ciliary artery (3)

Answer 30

1. Anterior ciliary artery
2. Long posterior ciliary artery
3. Short posterior ciliary artery

Question 31

Eyeball vessels: veins

Answer 31

Drain into ophthalmic veins
1. Choroid veins
2. Ciliary veins

Question 32

Choroid veins

Answer 32

Have special arrangements
End in single trunk piercing sclera

Question 33

Ciliary veins

Answer 33

Accompany anterior ciliary arteries