NSCI 324 Lecture Notes - Lecture 16: Vestibular Nuclei, Motor Learning, Abducens Nucleus
27 Feb 2017
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Take head velocity command and multiply by -1 to get eye velocity. Neurons go contra laterally (across the midline) to multiply by -1 or just put signal through inhibitory signal. 3 semicircular canals (horizontal, anterior, posterior) on each side of head the canals are orthogonal to each other to represent complete 3-d rotations. The semicircular canals transduce the signal to produce the head velocity command. Three canals on one side and 3 canals on the other side. One detects rotation in horizontal, one for oblique, and one for vertical. That"s three pla(cid:374)es that are orthogo(cid:374)al (cid:449)ith ea(cid:272)h other. The pulling directions of the sets of eye muscles line up perfectly with the canals*: these systems coevolved. Organization of canals helped to drive the development of the eye muscles. Orthogonal plane, can now rotate my head in any direction and some combination of the three canals detect rotation, signal to mns, goes to muscles.
