Nov1 M2-Histology Eye

Question 1

3 coats (tunics) of the eye

Answer 1

• fibrous tunic (sclera CT + cornea in the front bulging ant)
• vascular tunir or uvea (choroid CT all around + ciliary body above lens + iris ant to lens post to cornea)
• neural tunic (retina)

Question 2

aqueous humour is where in the eye

Answer 2

around the lens and behind the cornea

-is lymph like

Question 3

sclera charact

Answer 3

• dense regular CT like a tendon. whitish and stiff like a tendon
• collagen organized into layers
• covered by a thin conjunctiva
• poor in blood vessels

Question 4

choroid charact

Answer 4

• rich in pigment (melanocytes)

- rich in blood vessels

Question 5

sclera more charact

Answer 5

• covers 5/6 of eye post
• most of it = dense regular CT with intersecting collagen bundles
• melanocytes in deep layers
• attachment of eye muscles
• is white of the eye
• conjunctiva covering it = mucosa with loose CT and non keratinized squamous stratified epith

Question 6

cornea charact

Answer 6

• transparent
• avascular
• highly innervated
• bulges anteriorly

Question 7

details of cornea

Answer 7

ant to post

• stratified squamous epith
• thin Bowman’s membrane (CT that looks transparent bc type 1 collagen fibres not well organized). NO cells
• thick substantia propria (or stroma) (avascular CT). vascular in pathologies
• Descemet’s membrane BM of the epith posterior to it
• simple squamous epith (endothelium) (or posterior epith) = innermost layer of cornea

Question 8

contents of stroma of the cornea

Answer 8

• collagen fibres

- keratocytes (modified fibrocytes)