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Muscles move the arm

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ecolo111's version from 2016-11-25 18:20

Section 1

Question Answer
pectoralis major*- actionflexes, adducts and medially rotates arm
pectoralis major*- originsternal end of clavicle, sternum, costal cartilages 1 - 6 or 7
pectoralis major*- insertionintertubercular sulcus and greater tubercle of humerus
latissimus dorsiextends, adducts, and medially rotates arm, draws humerus downward as in hammering and swimming
categoryaxial
memorize

Section 2

Question Answer
deltoid* -originacromial end of clavicle, acromion and spine of scapula
deltoid* -insertiondeltoid tuberosity of humerus
deltoid* -actionabducts arm, anterior fibers alone flex and medially rotate arm; posterior fibers alone extend and laterally rotate arm
teres majorExtends, adducts and medially rotates arm
categoryscapular
memorize

Section 3

Question Answer
subscapularisrotates arm medially; helps to stabilize the shoulder joint
supraspinatusabducts arm, resists downward displacement of humerus when carrying heavy objects
infraspinatuslaterally rotates arm; helps to stabilize the shoulder joint
teres minorlaterally rotates arm; helps to stabilize the shoulder joint
categoryrotator cuff
memorize

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