chapt12LectureOutlines

chapt12LectureOutlines - Who is this Chelsey Thomas What is...

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1 Chapter 12 Muscular System Who is this? Chelsey Thomas. What is her problem? Moebius syndrome? A rare disorder which causes paralysis of facial muscles!!!
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2 Outline Overview of Muscular System Types and Functions of Muscles Skeletal Muscle Fiber Contraction Whole Muscle Contraction Muscles Have Motor Units Energy for Muscle Contraction Fast-Twitch and Slow-Twitch Fibers Muscle Disorders Homeostasis
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3 Types and Functions of Muscles Smooth muscle is located in the walls of hollow internal organs and contracts involuntarily. (non-striated / involuntary, visceral muscle) Cardiac muscle forms the heart wall and contracts involuntarily. (striated, involuntary) Skeletal muscle runs the entire length of the muscle and contracts voluntarily. (striated, voluntary)
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4 Types of Muscle
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5 Functions of Skeletal Muscles Support body. Movement of bones. Maintenance of constant body temperature. Assist movement in cardiovascular and lymphatic vessels. Protect internal organs. Stabilize joints.
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6 SKELETAL MUSCLES Macro scopic View
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7 Skeletal Muscles of the Body A whole muscle contains bundles of skeletal muscle fibers (= muscle cells), fascicles . Muscles are covered with fascia (dense connective tissue) that becomes tendons . Muscles originate on the stationary bone ( origin ), and insert on the bone that moves ( insertion ). Cooperating muscle pairs have prime movers , synergists , and antagonists . Muscles usually work in antagonistic pairs which work opposite one another to move in opposite directions.
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9
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10 Skeletal Muscles of the Body Muscles only contract , never push . Muscle spindles are modified muscle fibers that have a sensory nerve fiber wrapped around the middle of the muscle’s length so as to inform the CNS as to the state of that muscle for coordination with other muscles and for posture and muscle tone .
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11 Names and Actions of Skeletal Muscles Names based on characteristics. Size (ie. gluteus maximus ). Also : vastus (huge), longus (long), brevis (short). Shape (ie. deltoid ). Also : trapezius (trapezoid), latissimus (wide), terres (round). Location (ie. external obliques) Also : pectoralis (chest), gluteus (buttock), brachii (arm), sub (beneath).
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12 Names and Actions of Skeletal Muscles Direction of muscle fibers (ie. rectus , meaning straight, abdominis).
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chapt12LectureOutlines - Who is this Chelsey Thomas What is...

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