flexor digitorum brevis


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flexor digitorum brevis

short flexor muscle of toes; a muscle that inserts on the middle phalanges of the four lateral toes and flexes them. It is innervated by the medial plantar nerve.

flexor digitorum brevis

; FDB first-layer intrinsic foot muscle, immediately deep to the deep plantar fascia
  • origin from medial tubercle of calcaneal tuberosity and overlying plantar aponeurosis;

  • insertion divides into four parts, each of which forms a tendon inserting onto the fibrous flexor sheath of a lesser toe, then bifurcating into two slips passing to either side of a slip of flexor digitorum longus tendon to insert into the plantar surface of intermediate phalanx of the lesser toe

  • nerve supply medial plantar nerve

  • action flexion of proximal interphalangeal and metatarsophalangeal joints of lesser toes; reinforcement of longitudinal arch formation (sagittal plane) of the foot

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