Muscles that move the arm at the shoulder joint Questions and Answers
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Course
ARM
Institution
ARM
Muscles that move the arm at the shoulder joint Questions and Answers
deltoid
large, rounded, triangular shoulder muscle
deltoid anterior fibers
flex and medially rotate arm
deltoid lateral fibers
abduct arm
deltoid posterior fibers
extend and laterally rotate arm
p...
Muscles that move the arm at the
shoulder joint Questions and Answers
deltoid - answer large, rounded, triangular shoulder muscle
deltoid anterior fibers - answer flex and medially rotate arm
deltoid lateral fibers - answer abduct arm
deltoid posterior fibers - answer extend and laterally rotate arm
pectoralis major - answer large muscles on superior, anterior chest between the
sternum and arm.
action of pectoralis major - answer whole muscle adducts and medially rotates arm,
clavicular head only flexes arm, and sternocostal head only extends arm
infraspinatus - answer located in infraspinous fossa (inferior to spine of scapula) and
partially covered by deltoid)
action of infraspinatus - answer laterally roatates and adducts arm
teres minor - answer inferior to infraspinatus and partially covered by deltoid
action of teres minor - answer laterally roatates, extends and adducts arm
teres major - answer inferior to teres minor and partially covered by deltoid
action of teres major - answer extends, adducts, and medially rotates arm
latissimus dorsi - answer main large, flat muscle of middle and lower back that runs
laterally and attaches to superior portion of humerus
action of latissimus dorsi - answer extends, adducts, and medially rotates arm (if arm
is elevated over head, it brings it down
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