25 Pupil

Structures

Pupil

• Black circle, center

• allow light signal to go through lens

Iris

• sphincter: circular muscle, when contract decrease diameter

• dilator: radially oriented; fibers sticking out from center; increase size

Function

Miosis

• when eye down and out, evaluate pupillary dilation to see if parasympathetic intact

Adie's tonic pupil

• dilated pupil on one side

Mydriasis