BIOL 1412 Lecture Notes - Poliomyelitis, Anatomical Terms Of Location, Premotor Cortex
4 May 2014
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* levels of motor control: a) level 1: planning. Works w/ input from cerebellum b) level 2: Signals directly to lower motor neurons (via corticospinal tract) For fine skilled movement c) level 3: (fig. Brainstem nuclei desc. motor tracts lower motor neurons ( = indirect tracts) Receive input from cortex, basal nuclei, cerebellum. Involved in coordination of large muscle groups: Contains cell bodies of lower motor neurons. Networks of neurons (central pattern generators; cpgs) which set rhythmic repeated movements (eg. walking, running) Require cortical signals to begin or step movement e) cerebellum (fig. Role in planning + initiating movement sends input to cortical areas. Stores planned movement + compares actual to plan, using sensory input from eg. proprioceptors - corrects if necessary. Maintains balance, control eye movements & role in maintaining muscle tome ( = low level of contraction) Coordinates skilled voluntary muscle movement and timing of contractions involving more than 1 joint f) basal nuclei.
