muscle & muscle cell structure

Muscle& - contracted flaccidity all cells of a muscle are relaxed Motor Units Skeletal muscles are innervated by alpha(lower motor neurons

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PPT 1 - Introduction – 361 1 Muscle and Muscle Cell Structure Because speech is a motor activity that occurs when specific muscles are activated, it is important to know: 1. the structure and function of muscular tissue in general 2. the structure and function of skeletal muscles in particular 3. the relationship between the nervous and muscular systems Skeletal Muscles Degree of muscle contraction = tone - determined by the number of individual muscle cells that are contracted vs. relaxed - pathological conditions spacticity (tetany) - all cells of a muscle are
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Unformatted text preview: contracted flaccidity- all cells of a muscle are relaxed Motor Units Skeletal muscles are innervated by alpha (lower) motor neurons • cell bodies reside in brain stem or spinal cord • axons make up peripheral nerves (cranial or spinal) and synapse on muscle cells (between 2 and 150) Motor unit = alpha motor neuron and the muscle cells it innervates o smaller motor units are involved in fine motor control (e.g., tongue, finger) o larger motor units are involved in the control of larger muscle groups...
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This note was uploaded on 11/13/2010 for the course CODS 361 taught by Professor Gel during the Spring '10 term at WPUNJ.

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