Brachialis

Brachialis
Brachialis cut away view

Other Names

  • Arm (Side)
  • Lower Biceps

Heads

  • Brachialis

Movement

Elbow

Attachments

Origin

  • Humerus (Anterior)

Insertion

  • Ulna
    • Coronoid Process

Related Muscles

Comments

The brachialis muscle belly is located towards distal half of arm and is largely covered by biceps brachii.

The brachialis flexes arm along with other elbow flexor muscles, whether in pronation or supination. It is the only pure elbow flexor since it pulls on the ulna  which does not rotate. (Thompson & Floyd 1994)

At the initiation of elbow flexion, the brachialis is highly activated since its line of pull is more perpendicular to the ulna as compared to the biceps' insertion to the radius.

The brachialis becomes more readily activated during isometric elbow flexion. During a dynamic elbow flexion, the biceps is more readily activated than the brachialis. (Tax 1989)

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