The Shoulder JointMuscles of the Shoulder JointAnterior Shoulder MusclesSlide 4CoracobrachialisSlide 6Slide 7Pectoralis MajorSlide 9Slide 10SubscapularisSlide 12Superior Shoulder MusclesSlide 14DeltoidSlide 16SupraspinatusSlide 18Inferior Shoulder MusclesLatissimus DorsiSlide 21Slide 22Teres MajorSlide 24Posterior Shoulder MusclesSlide 26InfraspinatusSlide 28Slide 29Teres MinorSlide 31Study guidePracticeSlide 34Slide 35Slide 36Slide 37Slide 38Slide 39Slide 40Slide 41Slide 42Slide 43Slide 44Slide 45The Shoulder JointMuscles of the Shoulder JointChapter 5Anterior Shoulder Muscles•Coracobrachialis•Pectoralis Major•SubscapularisCoracobrachialis•O: Coracoid process•I: Anteromedial surface of midshaft of humerus•Actions: –Flexion –Adduction of the shoulder –Horizontal AdductionPectoralis Major•Origin:–Medial two-thirds of clavicle–Sternum•Insertion: intertubercular groove•Actions–Upper fibers (Clavicular)•Internal rotation•Horizontal Adduction•Flexion•Adduction–Lower fibers (Sternal)•Internal Rotation•Horizontal adduction•Extension •AdductionSubscapularis•O: Subscapular fossa•I: Lesser tubercle and crest of humerus•Actions: –Internal Rotation–Adduction–Extension •Stabilization •Anterior Rotator Cuff Muscle.Superior Shoulder Muscles•Deltoid •SupraspinatusDeltoid•Origin–Lateral 1/3 of clavicle (Anterior fibers)–Acromion process (Middle fibers)–Spine of scapula (Posterior fibers)•Insertion – deltoid tuberosityActionsAnterior – Abduction, Flexion, Horizontal adduction, & Internal rotation. Middle – AbductionPosterior – Abduction, Extension, Horizontal abduction, & External rotationSupraspinatus•O: Supraspinous fossa•I: Greater tubercle•Action: –Abduction•Stabilization•Superior Rotator Cuff Muscle.•Most injuired rotator cuff muscleInferior Shoulder Muscles•Latissimus Dorsi•Teres MajorLatissimus Dorsi•O: Spinous process of lower 6 thorasic and all lumbar and sacral vertebrae; iliac crest•I: Intertubercular groove•Actions: –Adduction–Extension–Internal Rotation–Horizontal AbductionTeres Major•O: Inferior angle of scapula•I: Intertubercular groove•Actions: –Extension–Adduction–Internal rotation•“Lats little helper”Posterior Shoulder Muscles•Infraspinatus•Teres MinorInfraspinatus•O: Infraspinous fossa•I: Greater tubercle•Actions: –External rotation–Horizontal abduction–Extension•Stabilization•Posterior Rotator Cuff Muscle•Second most commonly injured rotator cuff muscleTeres Minor•O: Upper 2/3 of lateral border of scapula•I: Greater tubercle•Actions: –External rotation–Horizontal abduction–Extension •Stabilization•Posterior Rotator Cuff MuscleStudy guide•List the muscles for Horizontal Adduction•Name the muscles for Horizontal AbductionPractice•List the muscles that do flexion of the shoulder•List the muscles that do extension of the shoulderPractice•List the muscles that do adductionadduction of the shoulderList the muscles that do abductionabduction of the shoulderPractice•List the muscles that do internal rotation of the shoulder•List the muscles that do external rotation of the shoulderName the muscle.CoracobrachialisName the actionAdduction of the shoulderName the muscle.Pectoralis MajorName the muscle.SubscapularisName the actionInternal rotation of the shoulderName the muscle.DeltoidName the actionAbduction of shoulderName the muscle.InfraspinatusName the actionExternal rotationName the muscle.Teres MajorName the actionAdduction of scapulaName the muscle.Teres MinorName the action if the humerus move directly to the posteriorExtension of the shoulderName the muscle.SupraspinatusName the actionAbduction of the shoulderCoracobrachialis Pect. MajorSubscapularisDeltoidSupraspinatus Teres MajorInfraspinatusTeres
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