Biceps Brachii Anatomy

Biceps Brachii Muscle

Origin:  Long head: supraglenoid tubercle and the superior portion of the glenoid labrum
Short head: lateral aspect of the apex of the coracoid process of the scapula
Insertion:  Radial tuberosity and the bicipital aponeurosis
Actions: Flexion of forearm
Innervation: Musculocutaneous nerve (C5 C6)
Blood Supply: Muscular branches from the brachial artery

Primary Actions of the Biceps Brachii

1.  Flexion of the forearm at the elbow

  Agonists:

  • Brachialis
  • Brachioradialis

  Antagonists:

  • Triceps brachii
  • Anconeus

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Secondary Actions of the Biceps Brachii

2. Assists with flexion of the arm at the shoulder

 Agonists:

  • Deltoid (anterior part)
  • Coracobrachialis
  • Pectoralis Major (clavicular head)

  Antagonists:

  • Deltoid (posterior part)
  • Triceps Brachii (long head)
  • Latissimus Dorsi
  • Pectoralis Major (sternal head)
  • Teres Major

2. Assists with supination of the forearm

  Agonists:

  • Supinator

Antagonists:

  • Pronator teres
  • Pronator quadratus