BLG 10A/B Lecture 12: Chapter 12-14
21 Apr 2020
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Chapter 12 & 13- the central nervous system/somatic nervous system. Transverse separates cerebrum & cerebellum: five lobes: frontal, parietal, temporal, occipital, insula. Insular lobe buried under temporal, parietal, & frontal: major dividing sulci: Central sulcus: separates frontal precentral gyrus & postcentral of parietal. Lateral sulcus: outlines temporal lobes: three regions: 1. Cerebral cortex- superficially gray matter: internally white matter, basal nuclei deep w/i white matter. In precentral gyrus (frontal: somatic, pyramidal cells: neurons allowing conscious control of muscle movement, pyramidal/corticospinal tracts: formed from axons projected down spinal cord, somatotopy: all muscles can be mapped on somatic cortex. Motor homunculi: rep. contralateral motor innervation of body parts. Cerebral cortex- premotor cortex: helps plan movements for skilled motor activities, controls learned, repetitious, patterned motor skills, simultaneous or sequential actions, voluntary functions dependant on sensory feedback. Cerebral cortex- broca"s area: one hemisphere (usually left, motor speech, planning speech & voluntary motor.
