Distal Phalanx of the Fingers, Posterior View

Description

Posteriorly, the distal phalanges of digits II to V are emphasized, with the dorsal surface of each distal phalanx shaft (corpus phalangis distalis) leading distally to the expanded tuft (tuberositas phalangis distalis) that supports the fingertip pulp. Proximal to each distal phalanx, the distal interphalangeal joint line is apparent where the base (basis) of the distal phalanx meets the head (caput) of the middle phalanx, while the metacarpals and carpal rows sit more proximally, forming the skeletal framework of the hand and wrist. Lateral and medial contours of each digit remain distinct, clarifying how the distal phalanges align with the long axes of the middle and proximal phalanges. Blue highlighting isolates the terminal phalanges. A posterior view of the distal phalanx is the teaching angle for extensor mechanism anatomy at the fingertip, where the terminal extensor tendon inserts on the dorsal base of the distal phalanx and where avulsion produces mallet finger with loss of active DIP extension. The same bony segment is central in crush injuries and tuft fractures, which can be subtle on radiographs yet clinically tied to subungual hematoma and nail bed laceration because the nail unit sits immediately dorsal to this bone. Orientation matters here, since dorsal versus palmar displacement at the DIP guides splinting strategy and flags instability when a large dorsal fragment is present. Hand anatomy and radiographic positioning courses use this plate to reinforce distal phalanx landmarks, DIP joint congruity, and the relationship of the terminal phalanx to nail apparatus injuries. It also fits emergency medicine and orthopedic teaching files discussing mallet finger, distal phalanx tuft fractures, and fingertip trauma documentation for operative notes and patient education. Anatomical accuracy verified by SciePro's Medical Advisory Board.