Abductor Pollicis Longus (APL) Muscle Anatomy The Abductor pollicis longus muscle lies immediately below the supinator and is sometimes united with it. It is found in the posterior compartment of the forearm. It is one of the five deep extensors in the forearm, along with the supinator, extensor pollicis brevis, extensor pollicis longus, and extensor…
Supinator Muscle Anatomy Supinator is a spiral muscle contained in the posterior compartment of the forearm, along with the brachioradialis, and the superficial and deep forearm extensors. It curls around the proximal part of radius, connecting it with the ulna. In doing so, the muscle crosses the sagittal axis of the forearm causing the supination…
Extensor carpi ulnaris Muscle Anatomy Extensor carpi ulnaris is a fusiform muscle in the posterior forearm. It spans between the elbow and the base of the little finger. Like all the muscles of this compartment, the extensor carpi ulnaris works as an extensor of the wrist. Moreover, due to its specific course, this muscle also…
Extensor digiti minimi Muscle Anatomy Extensor digiti minimi is a long, thin muscle found in the posterior forearm. It extends from the distal humerus to the fifth digit. Together with anconeus, brachioradialis, extensor carpi radialis longus, extensor carpi radialis brevis, extensor digitorum, and extensor carpi ulnaris, it is a member of the superficial forearm extensor…
Extensor digitorum Muscle Anatomy The extensor digitorum is a long muscle located in the posterior compartment of the forearm. Together with extensor carpi ulnaris and extensor digiti minimi, it comprises the group of superficial extensors of the forearm. These muscles can be easily palpated in the lateral aspect of the posterior forearm, especially during the…
Extensor carpi radialis brevis muscle Anatoy Extensor carpi radialis brevis (ECRB) is a short muscle emerging underneath the extensor carpi radialis longus and both muscles share a common tendinous synovial sheath[. It is an extensor muscle located superficially at the posterior compartment of the forearm. Origin It originates from the common extensor tendon at the…
Extensor carpi radialis longus Muscle Anatoy The extensor carpi radialis longus muscle is one of the five main muscles that control movements at the wrist. This muscle is quite long, starting on the lateral side of the humerus, and attaching to the base of the second metacarpal bone. Origin: It originates from the lateral supracondylar…
Brachioradialis Muscle Anatomy The brachioradialis is a muscle of the forearm that flexes the forearm at the elbow. It is also capable of both pronation and supination, depending on the position of the forearm. Origin It originates from the lateral supracondylar ridge of the humerus. Insertion It inserts into the distal radius (radial styloid process)….
Anconeus Muscle Anatomy The anconeus muscle is a small, triangular muscle located at the elbow. It is located at the posterior aspect of the elbow, extending from the distal humerus to the proximal ulna. It assists in the extension of the forearm and provides support for both the dorsal capsule of the humeroulnar joint and…
Dorsal Interossei Muscle Anatomy In human anatomy, the dorsal interossei (DI) are four muscles in the back of the hand that act to abduct (spread) the index, middle, and ring fingers away from the hand’s midline (ray of middle finger) and assist in flexion at the metacarpophalangeal joints and extension at the interphalangeal joints of…
