Biceps Brachii - Muscle Physiology & Functional Anatomy

 

Biceps Brachii Muscle

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:

Trigger points of the Biceps Brachii

 

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:

 

 


More Images of the Biceps Brachii Muscle

 

Biceps Brachii Muscle & superficial musculature

Biceps Brachii & Deep musculature

Biceps Brachii


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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