muscle-outline - Muscular System page 1 of 5 ANAT 11110...

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Muscular System page 1 of 5 ANAT 11110 Lectures 25, 26, & 27 Fall 2011 Muscle Tissue and the Muscular System I. Introduction A. Functions 1. Movement (movement of body parts, transport of materials) 2. Stabilization (body postures, organ function) 3. Thermogenesis (predominantly skeletal muscle) B. General characteristics 1. Possess irritability, contractility, extensibility, and elasticity 2. Composed of elongated cells 3. Capable of repair/healing, but not necessarily replacement by cell division II. Types A. Skeletal (aka, voluntary or striated) 1. Location: somatic/skeletal muscles, upper part of esophagus, diaphragm 2. Repair and regeneration: cells cannot divide, but can be replaced; repair process aided through hypertrophy 3. Multinucleated (originate through the fusion of several myoblasts) 4. Anatomy of a skeletal muscle a. A single muscle cell/fiber is surrounded by an endomysium b. A bundle of muscle fibers is called a fascicle, and is surrounded by a perimysium c. A group of fascicles makes up the muscle, and is surrounded by an epimysium
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Muscular System page 2 of 5 d. At the ends of the muscle, the endomysium, perimysium, and epimysium come together to form muscle tendons, which attach the muscle to bone 5. Anatomy of a skeletal muscle fiber a. Sarcolemma: the cell membrane of a muscle fiber b. Transverse tubules (aka, T tubules): continuous with the sarcolemma, extending into the interior of the fiber, surrounding the myofibrils c. Sarcoplasmic reticulum: specialized endoplasmic reticulum, forms a
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This note was uploaded on 01/03/2012 for the course ANAT 11110 taught by Professor Manley-buser during the Fall '11 term at Palmer Chiropractic.

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muscle-outline - Muscular System page 1 of 5 ANAT 11110...

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