The Shoulder Joint TEST MONDAY

Anterior Shoulder Muscles Coracobrachialis Pectoralis Major Subscapularis Biceps Brachii

Biceps Brachii Origin Short head: coracoid process of scapula Long head: supraglenoid tubercle of scapula Insertion Tuberosity of radius Action Flexion of the elbow and shoulder, Supinates forearm ***the long head is the “5th rotator cuff”

Coracobrachialis O: Coracoid process I: Anteromedial surface of midshaft of humerus Actions: (WEAK!) Flexion Adduction of the shoulder

Pectoralis Major Origin: Insertion: intertubercular groove Actions Medial two-thirds of clavicle Sternum Insertion: intertubercular groove Actions Upper fibers (Clavicular) Flexion Horizontal Adduction Lower fibers (Sternal) Internal/medial Rotation Horizontal adduction

Subscapularis O: Subscapular fossa I: Lesser tubercle and crest of humerus Actions: Internal Rotation Stabilization Anterior Rotator Cuff Muscle.

Superior Shoulder Muscles Deltoid Supraspinatus

Deltoid Origin Insertion – deltoid tuberosity Actions Lateral 1/3 of clavicle (Anterior fibers) Acromion process (Middle fibers) Spine of scapula (Posterior fibers) Insertion – deltoid tuberosity Actions Anterior –Flexion Middle – Abduction Posterior –Extension

Supraspinatus O: Supraspinous fossa I: Greater tubercle Action: Abduction Stabilization Superior Rotator Cuff Muscle. Most injured rotator cuff muscle

Inferior Shoulder Muscles Latissimus Dorsi Teres Major

Latissimus Dorsi O: Spinous process of lower 6 thorasic and all lumbar and sacral vertebrae; iliac crest I: Intertubercular groove Actions: Adduction Internal Rotation

Teres Major O: Inferior angle of scapula I: Intertubercular groove Actions: Adduction Internal rotation “Lats little helper”

Posterior Shoulder Muscles Infraspinatus Teres Minor Triceps Brachii

Triceps Brachii Origin Long head: infraglenoid tubercle of scapula Lateral head: posterior surface of humerus, Medial head: posterior surface of humerus, Insertion Olecranon process of ulna Action Chief extensor of elbow (long head extends the shoulder)

Infraspinatus O: Infraspinous fossa I: Greater tubercle Actions: External rotation Stabilization Posterior Rotator Cuff Muscle Second most commonly injured rotator cuff muscle

Teres Minor O: lateral border of scapula I: Greater tubercle Actions: External rotation Stabilization Posterior Rotator Cuff Muscle

Muscles of the scapula only

Trapezius Origin occipital bone, nuchal ligament, and spinous processes of C7 - T12 vertebrae Insertion Lateral third of clavicle, acromion, and spine of scapula Action superior fibers elevate, middle fibers retract, inferior fibers depress scapula;

Levator Scapula Origin C1 - C4 vertebrae Insertion Superior angle Action Elevates scapula

Rhomboid major and minor

Rhomboid major and minor Origin Minor: spinous processes of C7 and T1 vertebrae Major: spinous processes of T2 - T5 vertebrae Insertion Medial border of scapula Action Retract scapula

Serratus Anterior Origin the eight upper frontal ribs Insertion lateral border of scapula Action protracts scapula

Name the muscle. Coracobrachialis Name the action Flexion and Adduction of the shoulder

Name the muscle. Pectoralis Major Function Horizontal Adduction Internal roatation

Name the muscle. Subscapularis Name the action Internal rotation of the shoulder

Name the muscle. Deltoid Name the action Abduction of shoulder (middle third) Flexion (anterior deltoid) Extension (posterior deltoid)

Name the muscle. Infraspinatus Name the action External rotation

Name the action Name the muscle. Adduction of arm Teres Major

Name the muscle. Teres Minor Name the action if the humerus move directly to the posterior Extension of the shoulder

Name the muscle. Supraspinatus Name the action Abduction of the shoulder

Coracobrachialis Pect. Major Subscapularis Deltoid

Supraspinatus Teres Major Infraspinatus Teres Minor