Phalanx bone
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The phalanges are digital bones in the hands and feet of most vertebrates. In primates, the thumbs and big toes have two phalanges each, while the other digits have three phalanges each. The phalanges
The phalanges in a human hand
Distal phalanges of a Masai giraffe
Three-fingered sloth
Terminal phalanx of a Scelidotherium ground sloth
Metacarpal bones
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In human anatomy, the metacarpal bones, or "palm bones", collectively the metacarpus, are the appendicular bones that form the intermediate part of the hand between the phalanges and the carpal bones,
Phalanx bone
…are closest to the hand or foot. In the hand, the prominent, knobby ends of the phalanges are known as knuckles. The proximal phalanges join with the metacarpals of the hand or metatarsals of the foot at the metacarpophalangeal joint or metatarsophalangeal joint. The intermediate phalanx is not only intermediate…
Carpometacarpal joints of the left hand. Thumb on left.
X-ray
X-ray image of right hand with thumb on left.
Multiple fractures of the metacarpals (aka broken hand). (Right hand shown with thumb on left.)