Brachialis - Muscle Physiology & Functional Anatomy


Brachialis Muscle




  • Anterior lower half of humerus & medial and lateral intermuscular septa


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

Major Arteries:

  • Radial recurrent artery


Neural Innervation:

  • Musculocutaneous nerve (C5-C6) (from lateral cord)

  • Small supply from radial nerve (C7)


Trigger Points:

Trigger points of the Brachialis




Concentric Functions:

  • Elbow flexion

Eccentric Functions:

  • Deceleration of elbow extension


Isometric Function:


Related Muscles





More Images of the Brachialis Muscle

Brachialis Muscle (under biceps)




More Information about the Brachialis Muscle

The brachialis muscle is most active during isometric elbow flexion specifically when the elbow is at 90 degrees.  During dynamic elbow flexion the biceps brachii perform most of the work while the brachialis assists the elbow flexion.


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