Pinky finger

The pinky finger, also known as the fifth digit, little finger, or small finger, is the smallest and most ulnar of the five fingers on the human hand. It is located next to the ring finger and is opposite the thumb.

Anatomy

The pinky finger is composed of three phalanges: the proximal, middle, and distal phalanges. These bones are connected by interphalangeal joints, which allow for flexion and extension. The pinky finger is supported by the metacarpal bones of the hand, specifically the fifth metacarpal.

Muscles

The primary muscles responsible for the movement of the pinky finger include:

• Flexor digiti minimi brevis: This muscle flexes the proximal phalanx of the pinky.
• Abductor digiti minimi: This muscle abducts the pinky finger away from the hand.
• Opponens digiti minimi: This muscle allows the pinky to oppose the thumb.

Nerve Supply

The pinky finger is primarily innervated by the ulnar nerve, which provides both sensory and motor innervation. The ulnar nerve is responsible for the fine motor control and sensation of the pinky finger.

Blood Supply

The blood supply to the pinky finger is primarily provided by the ulnar artery, which branches into the superficial palmar arch and supplies blood to the pinky and other fingers.

Function

The pinky finger plays a crucial role in hand function, contributing to grip strength and dexterity. It is essential for tasks that require precision and fine motor skills, such as typing, playing musical instruments, and performing surgical procedures.

Cultural Significance

In many cultures, the pinky finger holds symbolic meanings. For example, in some cultures, a "pinky promise" is a gesture of trust and commitment. In others, wearing a ring on the pinky finger can signify membership in certain organizations or social status.

Clinical Relevance

Injuries to the pinky finger, such as fractures or dislocations, can significantly impact hand function. Conditions like Dupuytren's contracture can cause the pinky finger to bend towards the palm, affecting its mobility.

Also see

• Hand
• Finger
• Thumb
• Ring finger
• Ulnar nerve