Proximal phalanges are bones found in the limbs of most vertebrates. In humans, they are the bones at the base of a toe or finger, the prominent, knobby ends of which are often called the knuckles. In other vertebrates, proximal phalanges have a similar placement in the corresponding limbs, be they paw, wing or fin. In many species, they are the longest and thickest phalanx ('finger' bone)

1

Proximal-most phalanx within a digit.

phalanx 1

phalanx I

proximal-most phalanx

uberon

UBERON:0004302