Corpus: Finger

Anatomically, the fingers are identified as follows:

• thumb
• index finger
• middle finger
• ring finger
• little finger

The second to fifth fingers each comprise three phalanges: the proximal, middle (absent in the thumb), and distal phalanges.

Numerous ligaments stabilize the finger bones, maintaining their positional relationship. These include:

• collateral ligament
• accessory collateral ligament
• phalangoglenoid ligament
• anular ligaments of the finger

Additionally, diagonal fibers, such as Grayson's ligaments and Cleland's ligaments, secure the skin to the finger bones.

The fingers' arterial supply originates from the ulnar and radial arteries, forming two vascular arches in the hand. Specific arteries supplying the fingers are:

• dorsal digital arteries of hand
• proper palmar digital arteries
• radialis indicis artery
• princeps pollicis artery

Fingers are essential for fundamental actions like grasping and touching, as well as for communication tasks such as pointing, writing, and sign language. They are also integral to fine motor skills.

• Polydactyly: presence of more than 5 fingers
• Hexadactyly: presence of 6 fingers
• Heptadactyly: presence of 7 fingers
• Adactyly: absence of all fingers
• Oligodactyly: absence of one or more fingers
• Syndactyly: fusion of two or more fingers
• Acrosyndactyly: adhesion at the peripheral ends of the fingers
• Polysyndactyly: combination of polydactyly and syndactyly
• Microdactyly: abnormally small fingers
• Macrodactyly (megalodactyly): abnormal enlargement of the fingers
• Brachydactyly: abnormally short fingers
• Arachnodactyly: abnormally elongated, thin fingers ("spider fingers")
• Clinodactyly: crooked position of the phalanges
• Sclerodactyly: hardened or stiffened fingers
• Camptodactyly: flexion contracture of the little finger and possibly the ring finger