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8. Sesamoid Bones

In a few places, the body develops a bone within a tendon or muscle. These are sesamoid bones, and they act as pulleys for tendons, providing a smooth surface for the tendons to slide across to increase muscular force. The first metatarsal bone typically develops two sesamoid bones near the distal phalanx of the big toe. Some individuals develop only one sesamoid on the first metatarsal bone.

bones of the foot gaspr13 / Getty Images
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