Sclera

Question 1

Define

Answer 1

Sclera is the posterior 5/6th opaque part of the external fibrotic tunica of the eyeball

Question 2

Boundaries

Answer 2

It’s whole outer surface is covered my Tenons capsule. Another part: bulbar conjunctiva
Inner surface is in contact with the choroid. Potential space- suprachoroidal space
Anterior most part near the limbus there is a furrow which encloses the canal of Schlemm

Question 3

Thinnest

Answer 3

At the insertion of extra ocular muscles

Question 4

Apertures

Answer 4

Posterior: situated around the optic nerve, transmit long and short ciliary nerves and vessels

Middle: slightly posterior to the equator, four vortex veins

Anterior: 3-4mm away from the limbus, anterior ciliary vessels and branches from long ciliary nerves

Question 5

Microscopic structure

Answer 5

Episcleral tissue
Scleral proper
Lamina fusca