Digitus secundus

Digitus secundus

Latin	Digitus secundus manus, Digitus II
Nerve	Digital nerves
System	Skeletal

Digitus secundus, commonly known as the index finger or pointer finger, is the second digit of the human hand, located between the thumb (digitus primus) and the middle finger (digitus tertius). It is also referred to as Digitus II in anatomical terminology.

Structure

The index finger consists of three phalanges (bones) – the proximal, middle, and distal phalanges. It is connected to the hand by the second metacarpal bone. The movement of the index finger is controlled by several muscles including the flexor digitorum superficialis and flexor digitorum profundus for flexion, and the extensor digitorum for extension.

Function

The index finger is crucial for precise and dexterous movements of the hand. It is commonly used for pointing, which is a fundamental gesture in human communication. Additionally, the index finger plays a vital role in gripping and manipulation tasks, often working in conjunction with the thumb to perform fine motor skills.

Cultural aspects

In many cultures, the index finger is used to indicate direction or to emphasize a point in conversation. It is also commonly used in counting and in various cultural and religious gestures.

Clinical significance

Injuries to the index finger can significantly impair hand function, affecting the ability to perform everyday tasks. Common injuries include fractures, dislocations, and tendon injuries. Treatment varies depending on the severity of the injury but may include immobilization, physical therapy, or surgery.

See also

• Finger
• Hand
• Phalanges of the hand
• Metacarpal bones