Skeletal System
Base of Proximal Phalanx of Fourth Toe
Basis phalangis proximalis digiti quarti pedis
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The base is the expanded proximal end of the proximal phalanx of fourth toe. It is the proximal continuation of its body and contains a proximal articular facet, which articulates with the distal articular facet of the fourth metatarsal bone, forming the fourth metatarsophalangeal joint.
The base of proximal phalanx of fourth toe provides an insertion site for the third lumbrical, and fourth dorsal and second plantar interossei muscles of the foot. It also provides attachment sites for the collateral and plantar ligaments of the fourth metatarsophalangeal joint.
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