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Despite the bulk of the muscle body being visible from the anterior aspect of the forearm, the brachioradialis is a posterior compartment muscle and consequently is innervated by the radial nerve. [5] Of the muscles that receive innervation from the radial nerve, it is one of only four that receive input directly from the radial nerve.
Radial nerve of the right axilla, posterior view. The radial nerve originates as a terminal branch of the posterior cord of the brachial plexus. [1] It goes through the arm, first in the posterior compartment of the arm, and later in the anterior compartment of the arm, and continues in the posterior compartment of the forearm.
The posterior muscular branch, of large size, arises from the nerve in the groove between the triceps brachii and the humerus. It divides into filaments, which supply the medial and lateral heads of the triceps brachii and the anconæus muscles.
The brachioradialis, flexor of the elbow, is unusual in that it is located in the posterior compartment, but it is actually a muscle of flexor / anterior compartment of the forearm. The anconeus, assisting in extension of the elbow joint, is by some considered part of the posterior compartment of the arm.
The superficial branch of the radial nerve passes along the front of the radial side of the forearm to the commencement of its lower third. It is a sensory nerve. It lies at first slightly lateral to the radial artery, concealed beneath the brachioradialis.
The mobile wad (or mobile wad of Henry) is a group of the following three muscles found in the lateral compartment of the forearm: [1]. brachioradialis; extensor carpi radialis brevis
The supinator consists of two planes of fibers, between which passes the deep branch of the radial nerve.The two planes arise in common—the superficial one originating as tendons and the deeper by muscular fibers [2] —from the supinator crest of the ulna, the lateral epicondyle of the humerus, the radial collateral ligament, and the annular radial ligament.
It presents an anterior lip for the origin of forearm extensors, including the brachioradialis muscle above, and the extensor carpi radialis longus muscle below. [1] It also presents a posterior lip for the triceps brachii , and an intermediate ridge for the attachment of the lateral intermuscular septum .