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COMPARTMENTS AND MUSCLES OF ARM LEARNING OBJECTIVES KNOW THE COMPARTMENTS OF ARM AND HOW THEY ARE FORMED UNDERSTAND THE MUSCLES AND THEIR ACTIONS FOUND IN THE ARM CLINICAL ASPECT RELATED TO THE TOPIC LECTURE OUTLINE MEDIAL INTERMUSCULAR SEPTUM It extends along the medial supracondylar line behind the coracobrachialis insertion and fades out above b/w the muscle and the long head of triceps It gives origin to most medial fibres of brachialis and the medial head of triceps It is pierced by the ulnar nerve and the ulnar collateral artery LATERAL INTERMUSCULAR SEPTUM It extends along the medial supra-condylar line and fades out behind the insertion of deltoid. Posteriorly the medial head of triceps arises from it It is pierced by the radial nerve and the profunda brachii artery ANTERIOR AND POSTERIOR COMPARTMENTS Arm A. Anterior arm muscles are Flexors of forearm/elbow joint 1. Biceps brachii 2. Brachialis 3. Coracobrachialis B. Posterior arm muscles are Extensors of the forearm / elbow joint 1. Triceps brachii ATTACHEMENTS OF MUSCLES OF ARM Biceps brachii muscle • • • • Origin : Short head; Coracoid process : Long head; Supraglenoid tubercle Insertion : Radial tuberosity, bicipital aponeurosis Action : Supination, flexes elbow Nerve : Musculocutaneous nerve Coracobrachialis muscle • • • • Origin Insertion Action Nerve : Coracoid process : Humerus, middle of body,medial : Flexion (flexes shoulder) : Musculocutaneous nerve Brachialis muscle • • • • Origin Insertion Action Nerve : Humerus, ant. surface distal 1/2 : Ulna, coronoid process, ulnar tuberosity : Flexes elbow : Musculocutaneuos n. & radial n. Triceps brachii muscle • • • • Origin : Long head;Scapula, infraglenoid tubercle : Lateral head; Humerus, post. surface above groove for radial nerve : Medial head; below groove for radial n. Insertion : Ulna, olecranon process Action : Extends elbow Nerve : Radial nerve CLINCAL ASPECT TENOSYNOVITIS OF BICEPS TENDON COMPARTMENT SYNDROME BICEPS AND TRICEPS JERK DISUSE ATROPHY OF MUSCLES
