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Muscles of the Arm
muscles that act on the arm
| Question | Answer |
|---|---|
| Name the muscles of the rotator cuff. | deltoid, supraspinatus, infraspinatus, subscapularis, teres major, teres minor |
| Origin of deltoid: | lateral third of the clavicle, the acromion process, and the spine of the scapula. |
| Insertion of deltoid: | deltoid tuberosity of the humerus |
| Function of deltoid: | abducts the arm; anterior fibers flex and medially rotate the arm; posterior fibers extend and laterally rotate the arm. |
| Origin of biceps brachii: | long head: supraglenoid tubercle of the scapula. [[[]]] Short head: coracoid process of the scapula. |
| Insertion of biceps brachii: | tuberosity of the radius |
| Function of biceps brachii: | flexes the forearm and the arm; supinates the forearm. |
| Origin of brachialis: | anterior surface of the distal half of the humerus. |
| Insertion of brachialis: | coronoid process of the ulna. |
| Function of brachialis: | flexes the forearm. |
| Origin of triceps brachii: | long head: infraglenoid tubercle of the scapula [[[]]] lateral head: posterior surface of the humerus above the radial groove [[[]]] medial head: posterior surface of the humerus below the radial groove. |
| Insertion of triceps brachii: | olecranon process of the ulna. |
| Function of triceps brachii: | extends the forearm; long head also extends the arm. |
| Innervation of biceps brachii: | musculocutaneous |
| Innervation of brachialis: | musculocutaneous |
| Innervation of triceps brachii: | radial |
| Innervation of deltoid: | axillary |
Created by:
srbaboujian
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