7 Retinal Histology

Question 1

What is the photopigment of the Rod?

Where is 90% located? What about other 10%?

Answer 1

Rhodopsin

Membrane of the optic discs 90%

Cell membrane around the cell body 10%

Question 2

What photopigment has a peak absorption of light at wavelengths of about 500nm (blue-green light)?

Answer 2

Rhodopsin

Question 3

The apical processes of the RPE extend towards the Apex of the ____ outer segments and ENGULF the shed discs.

These discs are shed in the early morning.

Answer 3

ROD

Rods are shed early in morning. You used them all night, therefore shed in the morning to make way for the Cones during the day!

Question 4

What disease is a progressive degeneration of rod photoreceptors?

Answer 4

Retinis Pigmentosa (RP)

Question 5

RP begins in the _______ retina and progresses towards the _____ and _____ retina leaving only a small island of cone photoreceptors in the macula

Answer 5

Mid-peripheral

Central

Peripheral

Question 6

Humans have a + arrangement of pairs of microtubules that connect the cilium & basal body

Answer 6

9+0