BIOL 030 Lecture Notes - Lecture 20: Vestibulocochlear Nerve, Saccule, Basilar Membrane
22 Dec 2020
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Document Summary
The eye is a globe structure, with the majority of the eye situated within the skull. The eye is separated into two fluid-filled cavities: the anterior cavity is composed of the anterior and posterior chambers, both of which are filled with aqueous humour, lens, posterior compartment filled with vitreous humour. The internal portion of the eye is composed of three layers, or tunics: outer layer- fibrous. Scelera: internal aspect of the fibrous tunic, located posterior to the lens. Cornea: external aspect of the fibrous tunic, located anterior to the lens: middle layer- vascular. Choroid: contains the blood vessels that supply the eye with oxygen. Ciliary body: ciliary muscles (intrinsic eye muscles) Iris: contains the sphincter and dilating muscles which control the narrowing and widening of the pupil, contains pigments that create eye colour: deep layer- sensory (retina) Neural layer: photoreceptors (rods and cones), which are light sensitive cells that send signals to smaller nerves that converge to form cn ii.
