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Muscular System

Skeletal muscles are identified along with their origin and insertion. Included is a brief review of smooth, skeletal, and cardiac muscle tissues.

Darryl Dubs

on 9 December 2014

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Transcript of Muscular System

photo (cc) Malte Sörensen @ flickr Three Types of Muscle Tissue Smooth Muscle not striated
involuntary (not under conscious control)
found in walls of internal organs, blood vessels, skin (dermis) The Muscular System Cardiac Muscle Skeletal Muscle found in the walls of the heart
involuntary (not under conscious control)
contains intercalated discs usually attached to bones
voluntary (under conscious control)
multinucleated Structure of Skeletal Muscle Organs of the muscular system skeletal muscle tissue
nervous tissue
connective tissues Fascia Tendon Aponeuroses Dense connective tissue that surrounds muscle. Connects muscle to muscle (broad fibrous sheet). Connects muscle to bone (cordlike). Outermost layer of connective tissue surrounding a muscle. Connective tissue separating muscles into fascicles (bundles). Innermost layer of connective tissue separating individual muscle fibers (muscle cell). Skeletal Muscle Contraction Neuromuscular Junction Motor Unit A motor neuron and the muscle fibers it controls.
Epimysium Perimysium Endomysium The site where an axon and a muscle fiber meet (myoneural junction). Sliding Filament Theory When sarcomeres shorten, the thick and thin filaments do not change length; rather, they slide past one another, with the thin filaments moving toward the center of the sarcomere from both ends. Muscle Fiber (Myofiber) Structures sarcolemma - muscle cell membrane
sarcoplasm - muscle cell cytoplasm
myofibrils - protein filaments myosin - thick filaments
actin - thin filaments sarcomere - repeating patterns of striations (functional units of muscle contraction)
sarcoplasmic reticulum - endoplasmic reticulum (ER) Skeletal Muscles Muscles of the Face, Head, & Neck Muscles of the Deep Back, Abdominal Wall, & Pelvic Outlet Muscles of the Chest, Shoulder, & Upper Limbs Muscles of the Hip & Lower Limbs Skeletal Muscle Actions Origin - the end of the muscle that is attached to a relatively immovable or fixed part. Insertion - the end of the muscle that is attached to a movable part. Prime mover (agonist) - the muscle primarily responsible for producing an action. Synergists - muscles that contract and assist the prime mover. Antagonists - muscles that resist the action of the prime mover and cause movement in the opposite direction.
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