BSC 181 Study Guide - Quiz Guide: Abducens Nerve, Aqueous Humour, Sebaceous Gland
Document Summary
Cranial nerve iii: oculomotor nerve: levator palpebrae superioris (gives upper eye mobility, medial rectus: moves eye medially, superior rectus: elevates & turns eye medially. Cranial nerve iv: trochlear nerve: superior oblique: depresses & turns eye laterally. Cranial nerve vi: abducens nerve: lateral rectus: moves eye laterally. Fibrous: durable layer: contains sclera (protects/shapes eyeball) and cornea (bends light; contains pain receptors) Vascular: gives blood flow: contains choroid (supplies blood to all layers of eyeball) ciliary body (contrls lens shape; contains aqueous humor) and iris (colored part of eye; contains pupil that regulates amount of light entering eye) Iris: close vision/bright light: circular muscles contract and pupils constrict (let less light in, distant vision/dim light: radial muscles contract and pupils dilate (let more light in) Inner: location of receptors: retina: receptors for vision, outer pigmented layer: absorbs light; stores vitamin a. Inner neural layer: transparent and contains three neurons:
