142anatomyreview05 - Outward Rotation - the opposite of...

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Unformatted text preview: Outward Rotation - the opposite of inward rotation – the anterior aspect of the humerus moves laterally Muscles Deltoid Muscle – Origin - anterior, lateral third of clavicle; trop of the acromion; posterior border of the spine of the scapula Insertion – on the deltoid tuberosity on the middle, lateral surface of the humerus Actions – anterior – flexion and horizontal flexion - middle – abduction and horizontal flexion - posterior – horizontal extension, assists with extension Pectoralis Major Muscle Origin – inner two thirds of the anterior border of the clavicle; whole length of sternum and costal cartilages of the first six ribs Insertion – flat tendon about 3 inches wide to the outer lip of the bicipital groove of the humerus Action – clavicular portion – flexion, horizontal flexion - sternal portion – horizontal flexion, adduction, extension Latissimus Dorsi Muscle Origin – posterior crest of the ilium, back of sacrum, spines of the lower 6 thoracic and all lumbar...
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This note was uploaded on 08/05/2011 for the course KIN 142 taught by Professor Asmundson during the Spring '09 term at Simon Fraser.

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