Flexor Hallucis Brevis
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Description:[edit | edit source]
Flexor hallucis brevis is one of the third layer (of four layers) of plantar muscles. It is located adjacent to the plantar surface of the 1st metatarsal.
Origin:[edit | edit source]
Lateral part of the muscle is originated medically to the cuboid bone and laterally to the cuneiform bone.
Medial part of the muscle is originated from the tendon of tibialis posterior.
Insertion:[edit | edit source]
Both parts of the muscle are inserted on the hallux (sides of the base of proximal phalanx). The medial part pleads with the abductor hallucis muscle and the lateral part blends with the adductor hallucis muscle.
Nerve:[edit | edit source]
Nerve root S1-S2
Medial plantar nerve
Artery:[edit | edit source]
Supplied by branches of the posterior tibial artery
Function[edit | edit source]
Flexion of the great toe at the metatarsophalengial joint
Clinical relevance[edit | edit source]
Assessment[edit | edit source]
Palpation: [edit | edit source]
It is nearly impossible to palpate the FHB muscle while it is located deeply in the foot. (The third layer from 4 layers of the foot muscles).
Muscle strength: [edit | edit source]
As usual, the FHB strength can be measured manually by MMT grading. Start the test by having the patient in supine/long sitting position with the foot hanging over the table. With your hand, hold the foot just below the ankle for stabilization and ask him/her to bent the big toe while you resist the movement by your fingers of the other hand and start the grading.
