PSL440Y1 Study Guide - Final Guide: African Clawed Frog, Eyelid, Axon
Document Summary
Lecture 11: the visual system 2 the retina. Specialized regions of the retina: fovea & macula: area where (cone) photoreceptors are most densely packed. Trying to focus light onto the fovea. Purpose of extraocular muscles is to pinpoint focus light here: optic disc: area where the optic nerve exits the retina. Distinct from where you have highest acuity. These areas can be seen through an ophthalmoscope as a fundus image. Light reflecting off the blood vessels of the retina and choroid (behind the retina) when a camera flash is faster than the pupil can constrict. Massive amount of blood flow in back of eye to keep up with energy needed choroid is the vascular bed behind the retina normally pupil will constrict but the flash is faster specific to nocturnal animals. Light reflecting off the tapetum lucidum: a membrane behind the retina that increases reflective light to photoreceptors (humans don"t have this)
