Anatomy of eyeball

Question 1

what are the 3 tunics

Answer 1

Fibrous tunic
Vascular tunic
Nervous tunic

Question 2

Fibrous

Answer 2

Sclera and cornea

Question 3

Vascular

Answer 3

Choroid coat
Ciliary body (ciliary muscle, ciliary process) 

ciliary processes: attach lens to ciliary body via ZONULAR FIBRES (zonular fibres collectively form suspensory ligament)
ciliary body therefore controls shape of lens

iris

Question 4

Nervous

Answer 4

Retina

Question 5

Muscles of iris

Answer 5

smooth

radiating fibers and radial fibers

dilator

Question 6

CN 3

Answer 6

Sphincter of pupil and ciliary

Question 7

Opthalmoscope

Answer 7

Optic Disc

Macula Lutea

Question 8

Dim light

Answer 8

sm fibers of iris (radially arranged) move outward, pupil becomes bigger and moves towards outside

Question 9

Bright light

Answer 9

sm fibers move inward, pupil constricts

Question 10

Unequal size of eye pupil

Answer 10

anisocoria

Question 11

Key components of eye

Answer 11

retina: light detecting oart, postlateral+optic part of retina (both pigmented and neural parts PRESENT)
ciliary muscles
zonules
iris
cornea
pupil
lens
choroid
fovea centralis: lots of light sensitive receptor cells
optic disc: blind spot retina, no light receptor cells

Question 12

Sphincter pupillae

Answer 12

Parasymp nervous system
CONSTRICTION when stim.

(dilator pupillae=symp. nervous)

Question 13

Accomodation

Answer 13

ciliary muscle contracts, circ ciliary body reduces in size, zon fibres SLACKEN, reduce tension to outside lens, lens more round=accomodation (adjust lens to near vision)

Question 14

Anterior and posterior chambers

Answer 14

aqueous humour (nourishes)

vitreous humour (behind lens to retina)