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Shoulder Muscles

Origin, Insertion, Innervation, Action of Shoulder Muscles

QuestionAnswer
Deltoid O: Lateral one third of the clavicle, acromion and spine of the scapula I: Deltoid tuberosity of the humerus N: Axillary C5,6
Teres Major O: Inferior angle and lower one-third of lateral border of scapula I: Crest of the lesser tubercle of the humerus N: Lower subscapular C5, 6, 7
Supraspinatus O: Supraspinous fossa of scapula I: Greater tubercle of humerus N: Suprascapular C4, 5, 6
Infraspinatus O: Infraspinous fossa of scapula I: Greater tubercle of humerus N: Suprascapula C(4), 5, 6
Teres Minor O: Upper 2/3 of lateral border of the scapula I: Greater tubercle of humerus N: Axillary C5, 6
Subscapularis O: Subscapular fossa I: Lesser tubercle of humerus N: Upper and lower subscapularis C5, 6, 7
Serratus Anterior O: External surfaces of upper eight or nine ribs I: Anterior surface of medial border of the scapula N: Long thoracic C5, 6, 7, 8
Pectoralis Major O: Medial 1/2 of clavicle, sternum and cartilage of 1st to 6th ribs I: Crest of greater tubercle of humerus N: Lateral pectoral C5, 6, 7 (Upper fibers) Lateral and medial pectoral C6, 7, 8, T1 (Lower fibers)
Pectoralis Minor O: 3rd, 4th, 6th ribs I: Medial surface of the coracoid process of the scapula N: Medial pectoral, with fibers from a communicating branch of lateral pectoral C(6), 7, 8, T1
Subclavius O: First rib and cartilage I: Inferior surface of middle one third of clavicle N: subclavian C5, 6
Biceps Brachii O: Coracoid process of scapula (short head) Supraglenoid tubercle of scapula (long head) I: Tuberosity of the radius and aponeurosis of biceps brachii N: Musculocutaneous C5, 6
All Fibers of the Deltoid Action Abduct the shoulder
Anterior Fibers of the Deltoid Action Flex the shoulder Medially Rotate the shoulder Horizontally adduct the shoulder
Posterior Fibers of the Deltoid Action Extend the Shoulder Laterally Rotate the shoulder Horizontally abduct the shoulder
Teres Major Action Extend the shoulder Adduct the shoulder Medially rotate the shoulder
Supraspinatus Action Abduct the shoulder Stabilize the head of the humerus in the glenoid cavity
Infraspinatus Action Laterally rotate the shoulder Adduct the shoulder Stabilize the head of humerus in glenoid cavity
Teres Minor Action Laterally rotate the shoulder Adduct the shoulder Stabilize the head of the humerus in the glenoid cavity
Subscapularis Action Medially rotate the shoulder Stabilize the head of the humerus in the glenoid cavity
Serratus Anterior Action Abduct the scapula Upwardly rotate the scapula Depress the scapula Hold the medial border of the scapula against the rib cage (May act to elevate thorax during forced inhalation)
All Fibers Pectoralis Major Action Adduct the shoulder Medially rotate the shoulder Assist to elevate the thorax during forced inhalation (with arm fixed)
Upper Fibers Pectoralis Major Action Flex the shoulder Horizontally adduct the shoulder
Lower Fibers Pectoralis Major Action Extend the shoulder
Pectoralis Minor Action Depress the scapula Abduct the scapula Downwardly rotate the scapula (assist to elevate the thorax during forced inhalation with scapula fixed)
Subclavius Action Depress the clavicle and draw it anteriorly Elevate the first rib (to assist during inhalation) Stabilize the sternoclavicular joint
Biceps Brachii Action Flex the elbow Supinate the forearm Flex the shoulder
Triceps Brachii Action Extend the elbow Long Head Extends and adducts the shoulder
Created by: aublynn2010