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The Muscles Actions

actions of SHOULDER muscles

TermDefinition
trapezius (upper) elevates scapula (shrugs shoulder); rotates scapula upwards (glenoid cavity faces superiorly)
trapezius (middle) retracts & aids in elevation of scapula
trapezius (lower) depresses & retracts scapula; rotates scapula upwards (glenoid cavity faces superiorly); gives inferior stabilization of the scapula; aids to maintain spine in extension
levator scapulae elevates scapula; rotates scapula downwards (glenoid cavity faces inferiorly); works with upper trapezius to elevate & retract scapula
rhomboid major retracts & elevates scapula; inferior fibers aid in rotating glenoid cavity inferiorly)
rhomboid minor retracts & elevates scapula; assists in rotating the scapula downwards
serratus anterior protracts & rotates scapula upwards (glenoid cavity facing superiorly); stabilizes vertebral border of scapula to thoracic cage (along with rhomboids and middle trapezius)
pectoralis minor depresses & rotates scapula downward; important anterior shoulder stabilizer
subclavius depresses clavicle; pulls clavicle inferiorly & anteriorly
deltoid (anterior) abduction, horizontal flexion, medial rotation of humerus at shoulder
deltoid (middle) abduction of humerus at the shoulder
deltoid (posterior) abduction, horizontal extension, lateral rotation of humerus at shoulder
pectorals major (sternal) flexion, adduction, medial rotation, horizontal flexion of the humerus at shoulder; extends flexed humerus; through action on humerus, it depresses, protracts, rotates scapula downwards
Created by: rlizzyb
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