Health Sciences 2300A/B Lecture : Muscles of The Arm.docx

• School: Western University
• Department: Health Sciences
• Course: Health Sciences 2300A/B
• Professor: Jeremy Roth

Document Summary

Arm is from shoulder to the elbow and forearm is from the elbow to the wrist. Posterior arm works to extend the arm and extend the shoulder. Anterior arm/compartment works to flex the arm and the shoulder. Work to flex the shoulder (cross two joints) Long head originates at the supra glenoid tuberacle. Radial (bicipital) tuberocity is on the radius (insertion point) Bicipital aponeurosis splits across the ulna and encapsulates other muscles in area: significant because it is a tendenous sheath that lies across a group of muscles that encloses the heads, helps supports. Inervation of biceps is musculocutaneous nerve (most muscles in this compartment are inervated by this nerve) Coracobrachialis is also innervated by musculocutaneous: origin coracoid process. Functions as elbow and shoulder and elbow flexion. In order to use biceps muscle, arm has to be supinated or else it will be relaxed.