Muscle Monday - Brachialis & Coracobrachialis

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Muscle Monday - Brachialis & Coracobrachialis



Sounding like a pair of prehistoric dinosaurs, today we go deep into the muscles of the upper arm. And while these two little muscles lie deep and aren't terribly visible, they play critical movement roles for your arms.

The brachialis (brachialis anticus) is a muscle in the upper arm that flexes the elbow joint. It is a flat muscle that lies underneath the biceps brachii, originating from the lower half of the humerus, crossing the elbow joint, and inserting at the top of the ulna.

The coracobrachialis is a long and slender muscle on the front of the arm. It originates from the coracoid process of scapula (shoulder) and inserts in the middle of the humerus. The coracobrachialis muscle produces flexion and adduction of the arm at the shoulder joint. The coracobrachialis also serves as an antagonist muscle for the deltoid muscle, which inserts near the same spot on the opposite side of the humerus.

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