Muscles that move Arm/Anatomy of Elbow Joint

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Physical Education and Sport
Gail Amort- Larson

Muscles that Move the Arm •2 Muscles originate from axial skeleton: Pectoralis major and latissimus dorsi •7 muscles originate from scapula: Coracobrachialis, deltoid, supraspinatus, infraspinatus, subscapularis, teres major, teres minor Coracobrachialis: along with pectoralis major and latissimus dorsi adductors of shoulder O: Coracoid process I: *Medial* margin of shaft of humerus A: Adduction and flexion at shoulder Deltoid:multi-pennate, opposite fibers do opposing actions in same muscle O: Clavicle, acromion, and scapular spine I: Deltoid tuberosity of humerus A: Whole Muscle: abduction of shoulder; anterior fibers: flexion and medial rotation of humerus; posterior fibers: extension and lateral rotation of humerus •Rotator Cuff: Supraspinatus, infraspinatus, teres minor, and subscapularis (SITS) all but subscapularis originate from posterior side of scapula Supraspinatus: most commonly injured part of shoulder, Can’t palpate O: Supraspinous fossa of scapula I: Greater tubercle of humerus A: Initiates abduction at shoulder, first 20-30 degrees of abduction, then deltoid abducts Infraspinatus: can’t palpate O: Infraspinous fossa of scapula I: Greater tubercle of humerus A: Laterally rotates humerus Teres minor: can’t palpate O: Lateral border of scapula I: Greater tubercle of humerus A: Lateral rotation Subscapularis: serratus anterior+subscapularis are only 2 muscles that attach to anterior side of scapula, can’t palpate O: Subscapular fossa of scapula I: Lesser tubercle of humerus A: Medial rotation at shoulder Teres major: O: Inferior angle of scapula I: Medial lip of
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