Everything about Brachialis Muscle totally explained
The
brachialis (
brachialis anticus) is a
muscle in the upper
arm that flexes the
elbow joint. It lies just deep to
biceps brachii, and is a more powerful flexor of the elbow. It makes up part of the floor of the region known as the
cubital fossa.
Origin and insertion
The brachialis originates from the lower half of the front of the
humerus, near the insertion of the
deltoid muscle, which it embraces by two angular processes. Its origin extends below to within 2.5 cm. of the margin of the articular surface of the humerus at the elbow joint. It also arises from the
intermuscular septa of the arm, but more extensively from the medial than the lateral; it's separated from the lateral below by the
brachioradialis and
extensor carpi radialis longus muscles.
Its fibers converge to a thick tendon, which is inserted into the tuberosity of the
ulna and the rough depression on the anterior surface of the
coronoid process of the ulna.
Innervation
The brachialis muscle is innervated by the
musculocutaneous nerve, which runs on its superficial surface, between it and the
biceps brachii. Part of it's also innervated by the
radial nerve which allows it to be split during certain approaches to the arm. The divide between the two innervations is at the insertion of the deltoid.
Actions
The brachialis is the strongest flexor of the elbow. Unlike the biceps, the brachialis doesn't insert on the radius, and therefore can't participate in
pronation/
supination of the forearm.
Pronation/supination of the
forearm doesn't affect its action.
Variations
Occasionally doubled; additional slips to the
supinator,
pronator teres,
biceps brachii,
lacertus fibrosus, or
radius are more rarely found.
Additional images
Image:Gray207.png|Left humerus. Anterior view.
Image:Gray213.png|Bones of left forearm. Anterior aspect.
Image:Nerves_of_the_left_upper_extremity.gif|Nerves of the left upper extremity.
Further Information
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