01:830:310 Lecture Notes - Lecture 18: Superior Parietal Lobule, Supplementary Motor Area, Supramarginal Gyrus
30 Jul 2016
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Document Summary
Vestibular organ - consists of two otolith organs (the saccule and utricle) and three semicircular canals. Otoliths/otoconia - calcium carbonate particles lying next to hair cells. when the head tilts, otoliths push against hair cells and cause excitation. 3 semicircular canals - filled with a jellylike substance and hair cells that are activated when the head moves. Information travels through n. viii to nuclei in pons and medulla to spinal cord, nuclei for n. iii, iv, and vi, thalamus (vpi), and cerebellum. Retinotopic mapping - the way information comes in through the retina is related to how the information is mapped out on the occipital cortex. Tonotopic mapping - information is organized according to tone. A statue that shows receptive field and receptor density. Hands, lips, and tongue are especially large because they have many touch receptors. Input from primary sensory areas (1, 2, 3) Function - guiding movement by giving information about limbs, their position, and movement.
