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Proximal phalanx

Synonyms: base of the finger
German: Phalanx proximalis

1 Definition

The term proximal phalanx describes the bones which represent the base of the fingers and toes, and thus the bones that are immediately connected to the metacarpal bones (hand) or metatarsal bones (foot).

2 Anatomy

2.1 Fingers

The proximal phalanx is longer than the distal phalanges. The proximal extremity of the bones facing the metacarpal bones shows a concave articular cartilage, whose extension in frontal direction is bigger than in sagittal direction. Together with the cartilage surface of the corresponding metacarpal bone, it forms the metacarpophalangeal joint (base joint of the fingers).

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2.2 Toes

The proximal phalanx is longer than the distal phalanges of the toes. The proximal extremity of these bones turned to the metatarsal bones shows a concave articular cartilage. Together with the cartilage surface of the corresponding metatarsal bone, it forms the metatarsophalangeal joint (base joint of the toes). The base phalanges of the toes are significantly shorter than those of the fingers, and seen from above, they have a stout, biconcave basic shape.

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Specialties: Anatomy

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