Pouce

Pouce is a French term that translates to "thumb" in English. The thumb, or pouce, is the first digit of the hand and plays a crucial role in human dexterity. It is shorter and thicker than the other fingers and is opposable to them, a characteristic that differentiates humans from most other primates.

Anatomy

The pouce is made up of two phalanges, unlike the other fingers which have three. The two phalanges are the proximal phalanx and the distal phalanx. The thumb also includes a metacarpal bone, which connects the phalanges to the wrist, or carpus.

Bones of the left hand. Volar surface. (Thumb on right.)

The thumb is controlled by nine individual muscles, which are responsible for its wide range of motion. These muscles include the flexor pollicis longus, the flexor pollicis brevis, the abductor pollicis longus, the abductor pollicis brevis, the opponens pollicis, the adductor pollicis, and the extensor pollicis brevis and longus.

Function

The pouce is essential for many tasks that require fine motor skills, such as writing and grasping objects. Its opposability allows for a strong and precise grip, and it also plays a significant role in tactile sensation.

Medical Conditions

Various medical conditions can affect the pouce, including arthritis, carpal tunnel syndrome, and thumb sprain. Treatment for these conditions can range from rest and physical therapy to surgery in severe cases.

See Also

• Hand
• Finger
• Human anatomy