Biceps Brachii Muscle: Anatomy and Clinical Significance
Introduction
The biceps brachii is a prominent muscle of the anterior compartment of the arm. It is well-known for its role in flexing the elbow and supinating the forearm. Its bulging appearance is often associated with arm strength.
Anatomy of the Biceps Brachii Muscle
Origin
- Long head: Supraglenoid tubercle of the scapula.
- Short head: Coracoid process of the scapula.
Insertion
- Radial tuberosity: The biceps tendon inserts on the lateral aspect of the radial tuberosity.
- Bicipital aponeurosis: Extends into the fascia of the forearm.
Innervation
- C5, C6 nerve roots: Via the musculocutaneous nerve.
Blood Supply
- Brachial artery branches: Supplies the muscle.
Functions of the Biceps Brachii
- Flexion of the elbow: Primary mover in forearm flexion when supinated.
- Supination of the forearm: Rotates the radius to turn the palm upward.
- Weak shoulder flexion: Assists in shoulder movement.
Clinical Significance
Injuries and Disorders
- Biceps tendinitis: Inflammation of the biceps tendon, often due to overuse.
- Biceps rupture: Complete tear, usually at the long head, causing a "Popeye" deformity.
- Musculocutaneous nerve injury: Can impair flexion and supination functions.
Signs and Symptoms
- Pain, swelling, and weakness in the anterior arm.
- Palpable bulge in case of rupture.
Management
Includes rest, physiotherapy, and surgical repair in severe cases.
Summary
The biceps brachii is a key muscle in forearm flexion and supination, with important clinical implications in injuries such as tendinitis and rupture. Its anatomy and function are fundamental in understanding upper limb movements and pathology.
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