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Extensor pollicis longus muscle is labeled in purple. In human anatomy, the extensor pollicis longus muscle (EPL) is a skeletal muscle located dorsally on the forearm. It is much larger than the extensor pollicis brevis, the origin of which it partly covers and acts to stretch the thumb together with this muscle.
The extensor pollicis brevis originates on the ulna distal to the abductor pollicis longus, from the interosseus membrane, and from the dorsal side of the radius. Passing through the first tendon compartment together with the abductor pollicis longus, it is attached to the base of the proximal phalanx of the thumb.
Superficial. Deep. The extrinsic extensor muscles of the hand are located in the back of the forearm and have long tendons connecting them to bones in the hand, where they exert their action. Extrinsic denotes their location outside the hand. Extensor denotes their action which is to extend, or open flat, joints in the hand.
of phalanges, at all joints. Posterior compartment of the forearm. Extensor digitorum. Extensor digiti minimi (little finger only) Extensor indicis (index finger only) of phalanges, at interphalangeal joints [4] Lumbricals of the hand. Dorsal interossei of the hand. Palmar interossei.
The muscles of the hand are the skeletal muscles responsible for the movement of the hand and fingers. The muscles of the hand can be subdivided into two groups: the extrinsic and intrinsic muscle groups. The extrinsic muscle groups are the long flexors and extensors. They are called extrinsic because the muscle belly is located on the forearm.
In anatomy, the thumb extensors are: extensor pollicis longus muscle; extensor pollicis brevis muscle This page was last edited on 19 ...
The lateral border (radial side) is a pair of parallel and intimate tendons, of the extensor pollicis brevis and the abductor pollicis longus. [1] (Accordingly, the anatomical snuffbox is most visible, having a more pronounced concavity, during thumb extension.) The proximal border is formed by the styloid process of the radius
Extensor tendon compartments of the wrist are anatomical tunnels on the back of the wrist that contain tendons of muscles that extend (as opposed to flex) the wrist and the digits (fingers and thumb). The extensor tendons are held in place by the extensor retinaculum. As the tendons travel over the posterior (back) aspect of the wrist they are ...