PHYL 2041 Lecture Notes - Lecture 8: Bony Labyrinth, Semicircular Canals, Membranous Labyrinth
14 Dec 2018
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November 27, 2018: anatomy: inside the labyrinth. The stapes pushes on the oval window, which drives the cochlea. Note: the vestibular system has nothing to do with hearing! Instead, it deals with the detection of position. The bony labyrinth is complicated a chain of chambers inside the temporal skull. Within the labyrinth, there is a membrane (membranous labyrinth that is full of fluid) and a series of chambers, which are referred to as the utricle and the saccule. Semicircular canals have an enlargement (ampulla) that is composed of sensory neurons and sensory nerves that leave the canals. The nerves form the vestibular nerve that comes together as the 8th cranial nerve (vestibulocochlear nerve): two labyrinths one near each ear: Semicircular canals are in approximately 3 orthogonal planes (at right angles) the semicircular canals are in roughly 3 planes horizontal, superior, and posterior canals: functions: Control of eye, head, and body positions during movements.
