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Motor System 

Motor System
Chapter:
Motor System
Author(s):

Eduardo E. Benarroch

, Jeremy K. Cutsforth-Gregory

, and Kelly D. Flemming

DOI:
10.1093/med/9780190209407.003.0008
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date: 14 October 2019

All bodily movements, including those of internal organs, are the result of muscle contraction, which is under neural control. The muscles of the limbs, trunk, neck, and eyes are derived from somites. The muscles involved in facial expression, mastication, phonation, and swallowing are derived from the branchial arches. Somatic and limbic motor pathways arising from the cerebral cortex and brainstem control the activity of the motor neurons innervating all these muscles. The motor system, like the sensory system, includes a complex network of structures and pathways at all levels of the nervous system. This network mediates many types of motor activity. An understanding of its organization and the integration of the motor system with the sensory system is necessary for accurate localization and diagnosis of neurologic disease.

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