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Fourth Layer of Muscles of Plantar Part of Foot (Left)
Muscular System

Fourth Layer of Muscles of Plantar Part of Foot (Left)

Lamina quarta musculorum partis plantaris pedis

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Description

The fourth layer is the deepest of the four muscle layers of the plantar part of the foot. Overall, the muscles in this layer act to:

- abduct and adduct the second, third, fourth and little toes at their metatarsophalangeal joints;

- simultaneously flex the metatarsophalangeal joints and extend the interphalangeal joints of the second, third, fourth and little toes.

For classification purposes, the fourth layer of muscles of the plantar part of the foot is divided into two distinct groups:

- dorsal interossei muscles of foot;

- plantar interossei muscles.

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Foot Muscle

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The extrinsic foot muscles are those whose muscle bellies reside proximal to the foot, but tendons directly insert into the bones and ligaments.

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