Anatomy
Origin:
Medial process of the calcaneal tuberosity and plantar aponeurosis.
Insertion:
Sides of the plantar surface of the middle phalanges of the lateral 4 toes.
Key relations:
-Lies superior to the plantar aponeurosis.
-Gives rise to 4 tendons that lie superficial to the flexor digitorum longus tendons.
See plantar view of flexor digitorum brevis.
Also, see plantar view of quadratus plantae..
Functions
Flexes the lateral 4 toes at the proximal interphalangeal joints.
Supply
Nerve supply:
Medial plantar divisio of the tibial nerve (S1, S2).
Blood supply:
-Lateral plantar branch of the posterior tibial artery
-Medial plantar branch of the posterior tibial artery.
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