Anterior Chamber & Angle Structures

Question 1

index of refraction of the aqueous and vitreous humor

Answer 1

1.336

Question 2

approximately how deep is the anterior chamber?

Answer 2

3.6mm

Question 3

approximately how much fluid does the AC contain?

Answer 3

120-170uL

Question 4

internal scleral sulcus

Answer 4

located within the eye at the corneal-sclera junction and contains the structures of the angle

Question 5

name the structures within the internal scleral sulcus/angle

Answer 5

Peripheral Iris, Ciliary Body, Scleral Spur, Trabecular Meshwork (TM), Schlemm’s canal, and Schwalbe’s Line

Question 6

Average IOP

Answer 6

15.5 mmHg

Question 7

grading systems for the angle

Answer 7

Van Herrick, Becker-Shaffer

Question 8

Scleral spur

Answer 8

circular band of collagen and elastin fibers, origin site for the longitudinal CB muscle and TM lamellae

Question 9

The only areas of the sclera that contain elastin

Answer 9

scleral spur, lamina cribrosa, and lamina fusca

Question 10

Apex of TM points which way

Answer 10

anteriorly towards Schwalbe’s line

Question 11

Most external layer/border of the TM

Answer 11

Juxtacanalicular tissue (aka cribriform layer)

Question 12

innermost layer/border of the TM

Answer 12

uveoscleral meshwork (unconventional outflow site)

Question 13

middle layer of TM

Answer 13

corneoscleral meshwork (conventional outflow method)

Question 14

Schlemms canal

Answer 14

contains multiple internal collector channels to increase surface area for aqueous filtration

Question 15

two major routes of aq flow out of Schlemm’s canal

Answer 15

1. external collector channels -> deep scleral venous plexus -> intrascleral venous plexus -> episcleral venous plexus
2. aqueous veins of Ascher -> episcleral venous plexus

Question 16

Where do the episcleral veins drain?

Answer 16

ACV -> muscular v -> S/I ophthalmic v -> cavernous sinus -> S/I petrosal sinus -> internal jugular vein -> brachiocephalic vein -> sup vena cava -> RA heart

Question 17

Schwalbe’s line

Answer 17

represents termination of Descmets

Question 18

Posterior embryotoxon

Answer 18

anteriorly displaced Schwalbe’s line