BoneLong bone

Proximal phalanx of the index

Latin: Phalanx proximalis sinistra

Location: Hand — digits

Paired structure: one on the left and one on the right side of the body.

View the proximal phalanx of the index in 3D

Function

The first segment of each finger — its base meets the metacarpal head (the knuckle) at the MCP joint and its head forms the PIP joint that lets the finger curl.

Landmarks

  • Base
  • Shaft
  • Head
  • Palmar ridge (flexor sheath)

Articulations (joints)

  • Metacarpal 2
  • Next phalanx distally

Clinical relevance

Proximal phalanx shaft fractures spiral and rotate — any overlapping fingernails on making a fist need fixation.

Educational anatomy reference, not medical advice. About this content.