The brachialis is a muscle located in the upper arm that plays a crucial role in flexing the elbow. It lies beneath the biceps brachii muscle and is considered a "pure flexor" of the forearm at the elbow, meaning it primarily contributes to bending the elbow. The brachialis originates on the anterior surface of the humerus (upper arm bone) and inserts onto the coronoid process of the ulna (forearm bone).
Here's a breakdown of the key features of the brachialis:
- Location: Anterior compartment of the upper arm, deeper than the biceps brachii.
- Function: Primary flexor of the elbow, responsible for bending the elbow joint.
- Origin: Anterior surface of the distal half of the humerus.
- Insertion: Coronoid process of the ulna.
The brachialis is a powerful muscle that assists in various daily activities, such as lifting objects, carrying bags, and writing. Its action is essential for performing many movements that involve bending the elbow.
