The sesamoid bones just proximal to the head of the first metatarsal serve many functions including increasing the internal moment arm of the flexor hallucis longus.

Name: The sesamoid bones just proximal to the head of the first metatarsal serve many functions including increasing the internal moment arm of the flexor hallucis longus.
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Quizplus · Accepted Answer

The sesamoid bones increase the internal moment arm of the flexor hallucis brevis, not the flexor hallucis longus.

The Sesamoid Bones Just Proximal to the Head of the First