Brachialis - Muscle Physiology & Functional Anatomy

Anatomy

Origin:

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

Insertion:

• 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:

Physiology

Concentric Functions:

• Elbow flexion
  

Eccentric Functions:

• Deceleration of elbow extension

Isometric Function:

Related Muscles

• Biceps Brachii

• Brachioradialis

Antagonist:

• Triceps Brachii
• Anconeus
  

Exercises:

• Biceps Exercise Videos

More Images of the Brachialis Muscle

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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