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Sesamoid Bones of Foot
Skeletal System

Sesamoid Bones of Foot

Ossa sesamoidea pedis

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Structure

The sesamoid bones of the foot are the pair of small, oval, nodule-like bones found along the plantar aspect of the great toe. The two distal tendons of the flexor hallucis brevis muscle each contain one of these sesamoid bones.

In some individuals, other sesamoid bones within the foot may be found at the metatarsophalangeal joints of the second and third toes.

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Anatomical Relations

The sesamoid bones of the foot are located inferior to the first metatarsophalangeal joint, within the tendons of the flexor hallucis brevis muscle. The tendon of the flexor hallucis longus muscle travels between the sesamoid bones.

Function

In general, sesamoid bones are those found embedded in tendons and joint capsules. Their functions are to:

- strengthen a tendon;

- adjust the line of pull of a muscle;

- reduces friction between its tendon and adjacent bones.

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Sesamoid Bone

ScienceDirect image

The patella is a sesamoid bone that is located within the tendon of the quadriceps femoris muscle.

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