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The Brachialis Muscle (brachialis anticus), located deep in the anterior region of the upper arm, is the primary muscle responsible for elbow flexion. It lies beneath the biceps brachii and forms the floor of the cubital fossa. Extending from the humerus to the ulna, this muscle provides over 50% of elbow flexion, acting as a more powerful flexor than the biceps. Anatomy Morphology and Connection Points This muscle originates from the anterior surface of the distal half of the humerus. Its origi