Post compartment of arm
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The posterior compartment of the arm contains the triceps muscle, which has three heads that originate on the scapula and humerus and insert into the ulna. The triceps is innervated by the radial nerve and supplied by the profunda brachii and ulnar collateral arteries. The radial and ulnar nerves also pass through this compartment, with the radial nerve accompanying the profunda brachii artery in the spiral groove to innervate the triceps and other arm muscles. The ulnar nerve lies posterior to the medial head of the triceps and is accompanied by the superior ulnar collateral vessels.
Post compartment of arm
- 1. Posterior compartment of Arm Dr.Heta Patel(PT) AssistantProfessor ARIP CHARUSAT
- 2. Contents of the Posterior Compartment of the Arm • Muscle: The triceps muscle • Nerve supply to the muscle: Radial nerve. • Blood supply: Profunda brachii and ulnar collateral arteries • Structures passing through the compartment: Radial nerve and ulnar nerve
- 3. Triceps muscle • Origin: • Long head: from the infraglenoid tubercle of the scapula. • Lateral head: from the upper half of the posterior surface of the shaft of the humerus. • Medial head: from the lower half of the posterior surface of the shaft of the humerus • Insertion: • Into the upper surface of the olecranon process of the ulna. • Nerve Supply: • From the radial nerve. • Action: • Extension of the forearm at the elbow joint.
- 5. Radial Nerve • The origin of the radial nerve from the posterior cord of the brachial plexus in the axilla. • The nerve winds around the back of the arm in the spiral groove. • In the spiral groove, the nerve is accompanied by the profunda vessels, and it lies directly in contact with the shaft of the humerus. • It pierces the lateral fascial septum above the elbow and continues downward into the cubital fossa in front of the elbow, between the brachialis and the brachioradialis muscles.
- 6. Branches of the radial nerve In the axilla, • Muscular branches to the long and medial heads of the triceps • Posterior cutaneous nerve of the arm. In the spiral groove • Muscular branches to the lateral and medial heads of the triceps and to the anconeus muscle. • The lower lateral cutaneous nerve of the arm • The posterior cutaneous nerve of the forearm. In the anterior compartment of the arm • Muscular branches to the brachialis, the brachioradialis, and the extensor carpi radialis longus muscles. • Articular branches to the elbow joint.
- 9. Ulnar Nerve • It is a branch of the medial cord of the brachial plexus • It pierces the medial fascial septum and descends behind the septum, covered posteriorly by the medial head of the triceps. • The nerve is accompanied by the superior ulnar collateral vessels. • At the elbow, it lies behind the medial epicondyle of the humerus. • It continues downward to enter the forearm between the two heads of origin of the flexor carpi ulnaris Branches • The ulnar nerve has an articular branch to the elbow joint
- 11. Profunda Brachii Artery • The profunda brachii artery arises from the brachial artery near its origin. • It accompanies the radial nerve through the spiral groove, supplies the triceps muscle, and takes part in the anastomosis around the elbow joint. • Superior and Inferior Ulnar Collateral Arteries • The superior and inferior ulnar collateral arteries arise from the brachial artery and take part in the anastomosis around the elbow joint.