Biceps Brachii - Muscle Physiology & Functional Anatomy

Anatomy

Origin:

• Long Head

  • Supra- glenoid tubercle of scapula.
    

• Short head

  • Coracoid process of scapula (with coracobrachialis)
    

Insertion:

• Posterior border of radial tuberosity (over bursa) & bicipital aponeurosis to deep fascia & subcutaneous ulna

Major Arteries:

• Brachial artery

Neural Innervation:

• Musculocutaneous nerve (C5-C7)

Trigger Points:

Physiology

Concentric Functions:

• Elbow flexion

• Forearm supination

• Shoulder flexion (weak)

Eccentric Functions:

• Deceleration of elbow extension & pronation

• Shoulder extension

Isometric Function:

• Assists in dynamically stabilizing the gleno-humeral joint and radioulnar joint during functional movements

Related Muscles

• Brachialis

• Brachioradialis

Antagonist:

• Triceps Brachii
• Pronator Teres
• Pronator Quadratus
  

Exercises:

• Biceps Exercise Videos

More Images of the Biceps Brachii Muscle

More Information about the Biceps Brachii Muscle

The biceps brachii muscle is considered to be triarticulate meaning it produces movement at 3 different joints.  In the case of the biceps brachii, it supinates (laterally rotates) the forearm, flexes the elbow and has a small roll in shoulder flexion when the joint is in certain positions

The biceps brachii is a stronger elbow flexor when the forearm (radioulnar joint) is supinated.

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