Myology Overview

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Physical Education and Sport
Gail Amort- Larson

Myology •skeletal muscles attach to bone(directly or indirectly, skin or fascia) -most muscles connect to bone, fascia is connective tissue •Skeletal muscles: -produce skeletal movement -maintain posture and body position -support soft tissues -Regulate entering and exiting of material -Maintain body temperature(muscles generate heat) •Origin: Remains stationary (usually) •Insertion: Moves (usually) •Commonly the origin is proximal to the insertion •Muscles can be grouped according to their primary actions into 3 types: •Prime Movers (Agonists): are chiefly responsible for producing a particular movement •Synergists: assist the prime mover in performing an action -If a synergist stabilizes the origin of the agonist it is called a fixator -synergists can work with agonists to perform actions that neither can do alone -usually most useful at start of a movement when prime mover is stretched and has low power •Antagonists: are muscles whose actions oppose that of the agonist: -If the agonist produces flexion, the antagonist will produce extension Naming of Skeletal Muscles •Specific body regions: -Brachialis •Shape of Muscle: -Trapezius •Orientation of Muscle fibers: -Rectus(straight), transversus(across longitudinal axis), oblique(at an oblique angle across longitudinal axis) •Specific or unusual features: -Biceps (2 origins) •Identification of origin and insertion: -Sternocleidomastoid •Primary functions: -flexor carpi radialis •References to actio
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