proximal phalanx of the thumb (left) (Phalanx proximalis prima)
Educational content only — not medical advice.
Anatomy
the longest phalanx of the thumb: its concave base receives the metacarpal head, and its pulley-shaped head articulates with the distal phalanx. This phalanx belongs to the thumb of the left hand.
Clinical notes
The commonest of hand phalanx fractures; rotational malunion disables precise pinch, and thumb rotation must be assessed in function.
Related structures
Educational references
FAQ
What is the role of the proximal phalanx of the thumb (left)?
the longest phalanx of the thumb: its concave base receives the metacarpal head, and its pulley-shaped head articulates with the distal phalanx. This phalanx belongs to the thumb of the left hand.
Why is the proximal phalanx of the thumb (left) clinically important?
The commonest of hand phalanx fractures; rotational malunion disables precise pinch, and thumb rotation must be assessed in function.
Source & license
Derived from Z-Anatomy (Gauthier Kervyn et al.), CC BY-SA 4.0 (https://creativecommons.org/licenses/by-sa/4.0/); upstream geometry from BodyParts3D, © The Database Center for Life Science. license details