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Muscles of the Arm

muscles that act on the arm

QuestionAnswer
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