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Origins Insertions And Actions Of Muscles

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bubukeze's version from 2017-04-19 15:17

Origins Insertions And Actions of Muscles of the Shoulder

 

MuscleOriginInsertionAction
TrapeziusOccipital bone and spines of thoraxic and cervical vertebrae.Clavicle, acromion process of scapula, and spine of scapula.Extends head and elevates scapula.
Rectus FemorisIliac spine.Patella.Extension of leg at knee.
Biceps BrachiiCoracoid process of scapula, tubercle above glenoid fossa.Radial tuberosity of radius.Flexes and supinates forearm, and flexes arm.
Triceps BrachiiTubercle below glenoid fossa, lateral and medial surface of humerus.Olecranon process of ulna.Extend forearm and help extend arm.
Splenius CapitusSpinous processes.Mastoid process.Extend, hyperextend head, rotates head.
Pectoralis MajorClavicle, sternum, costal cartilages of upper ribs.Intertubercular groove of humerus.Whole muscle adducts and medially rotates arm, clavicular head only flexes arm, and sternocostal head only extends arm.
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