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Transcript
BRAINSTEM’S INVOLVEMENT IN MOTOR PROCESS MAIN FUNCTIONS IN MOTOR PROCESS: • Mediates motor (and sensation) control of the head, neck and face. • Influences parasympathetic reflexes • Contains ascending and descending pathways that carry motor (and sensory) information to other divisions of the central nervous system CRANIAL NERVES • Most of cranial nerves arise from brainstem • The occular motor nerves (III.,IV.,VI.) control movements of the eyes • The spinal accessory nerve (XI.) innervates the trapesius and sternocleidomatoid muscles on the same side of the body. • The hypoglossal nerve (XII.) innervates the muscles of the tongue. NUCLEI OF BRAINSTEM • General visceral Motor Column: It contains preganglionic neurons that control eye movements and parasymphatetic preganglionic neurons that innervate multiple regions of parasymphatetic system. • Special Visceral Motor Column: TheseI nuclei innervates muscles of mastication,facial expression, larynx pharynx.
