Extensor digitorum brevis manus muscle

Extensor digitorum brevis manus muscle is a muscle located in the human hand. It is considered an anatomical variation, as it is not present in all individuals. The muscle originates from the extensor retinaculum and the dorsal carpal ligament, and inserts into the extensor digitorum of the middle and ring fingers.

Etymology

The term "extensor digitorum brevis manus" is derived from Latin. "Extensor" refers to the muscle's function of extending, or straightening, the digits (fingers). "Brevis" means short, and "manus" refers to the hand. Thus, the name of the muscle describes its function, location, and size.

Anatomy

The extensor digitorum brevis manus muscle is a rare anatomical variant. It is not present in all individuals, and when it is present, it may vary in size and location. The muscle originates from the extensor retinaculum and the dorsal carpal ligament, which are located on the back of the wrist. It inserts into the extensor digitorum of the middle and ring fingers, allowing it to aid in the extension of these fingers.

Clinical significance

Due to its rarity, the extensor digitorum brevis manus muscle is not often discussed in clinical settings. However, when present, it may be mistaken for a mass or tumor on imaging studies. Knowledge of this muscle and its variations is important for surgeons and radiologists to avoid misdiagnosis.

Related terms

• Extensor digitorum muscle: A muscle of the posterior forearm present in all individuals. It extends the fingers and the wrist.
• Extensor retinaculum of the hand: A fibrous band on the back of the wrist that holds the extensor tendons in place.
• Dorsal carpal ligament: A ligament on the back of the wrist.