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Little finger

life science Maturity 9-11 Next article →

The little finger is the smallest digit of the human hand.

Signet and Wedding rings
Signet and Wedding rings

It is also known as the pinkie, the baby finger, or the fifth digit. Anatomically, it is the most ulnar digit. This means it is positioned on the side of the hand closest to the ulna bone. It sits directly next to the ring finger. While it is small, it plays important roles in movement and culture.

Nine specific muscles control the movement of the fifth digit. Three of these muscles are located in the hypothenar eminence, which is the fleshy area of the palm. These include the opponens digiti minimi, the abductor minimi digiti, and the flexor digiti minimi brevis. Note that the "longus" version of this muscle is absent in most humans. Two extrinsic flexors, the flexor digitorum superficialis and the flexor digitorum profundus, help the finger bend. Two extrinsic extensors, the extensor digiti minimi and the extensor digitorum, help it straighten. Finally, two intrinsic muscles, the fourth lumbrical and the third palmar interosseous, provide additional control.

Signet and Wedding rings
Signet and Wedding rings

The term "pinky" has a clear linguistic history. It is derived from the Dutch word "pink," which means little finger. The earliest recorded use of the specific spelling "pinkie" comes from Scotland in 1808. Today, the term is very common in American English and Scottish English. It is also used extensively throughout Commonwealth countries, including Canada, Australia, and New Zealand.

Cultural gestures often involve the little finger.

Pinky swear
Pinky swear

Among children in the United States, a "pinky swear" or "pinky promise" is a common way to make a vow. This involves wrapping one person's pinky around another's. Similar traditions exist in China and Korea. In those cultures, people link their pinky fingers and then stamp their thumbs together to make a "yaksok," which is a promise. The finger is also used in the shaka sign and the sign of the horns. In a different cultural context, members of the Japanese yakuza have used the removal of the little finger, known as "yubitsume," as a penalty for offenses.

Jewelry also has a strong connection to this digit. A signet ring is traditionally worn by gentlemen on the little finger of the left hand. This practice remains common in European cultures, as well as in Australia and the United Kingdom. The ring is even part of the regalia for many European monarchies. The Pope also wears a signet ring on his left little finger. In modern times, people wear signet rings on different digits, but the little finger remains a usual choice.

Signet and Wedding rings
Signet and Wedding rings

Specific professions use the little finger for symbolic rings. In Canada, most engineers wear a symbolic "Iron Ring." This ring represents both pride and humility within the engineering profession. It is always worn on the little finger of the engineer's dominant hand. In the United States, members of the Order of the Engineer wear a stainless steel "Engineer's Ring." They wear this on the fifth digit of their working hand after accepting the Obligation of an Engineer.

Modern technology has created new ways we use this finger. Many smartphone users use the little finger as a support while typing one-handed. They position the finger underneath the phone to prop it up. This allows the three middle fingers to hold the device while the thumb types. Some users have reported experiencing pain or seeing dents in their skin from this habit. Doctors refer to this phenomenon as "smartphone pinky" or "iPhone pinky." These skin indentations are generally not a cause for alarm, as they disappear after a short time without phone use.

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