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Quadratus Plantae (Flexor Accessorius)

Flexor accessorius emerges by two heads via the medial and lateral tubercles of the calcaneus and the adjacent tubercles of the long plantar ligament and lies deep to flexor digitorum brevis.

Interactive Anatomical Interface

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abductor digiti minimi
flexor digitorum brevis
abductor hallucis
first proximal phalanx
first distal phalanx
calcaneus
Flexor hallucis brevis
adductor hallucis
flexor digitorum longus
tibialis posterior

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abductor digiti minimi
flexor digitorum brevis
abductor hallucis
first proximal phalanx
first distal phalanx

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calcaneus
Flexor hallucis brevis
adductor hallucis
flexor digitorum longus
tibialis posterior
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Metatarsal
quadratus plantae
lumbricals
flexor hallucis longus
Flexor digitorum longus
tibialis posterior
Medial cuneiform
Proximal phalanx
calcaneus
Tibialis anterior
Navicular Bone
fibularis longus
fibularis brevis

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Metatarsal
quadratus plantae
lumbricals
flexor hallucis longus
Flexor digitorum longus
tibialis posterior
Medial cuneiform

Highlight
Proximal phalanx
calcaneus
Tibialis anterior
Navicular Bone
fibularis longus
fibularis brevis
-
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Proximal phalanx
Metatarsal
flexor digiti minimi brevis
adductor hallucis ( oblique head )
adductor hallucis ( transverse head )
flexor hallucis brevis
fibularis (peroneous ) brevis
fibularis ( peroneous ) longus
calcaneus
tibialis posterior
medial cuneiform
cuboid bone
Talus
Navicular Bone
tibialis anterior

Highlight
Proximal phalanx
Metatarsal
flexor digiti minimi brevis
adductor hallucis ( oblique head )
adductor hallucis ( transverse head )
flexor hallucis brevis
fibularis (peroneous ) brevis

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fibularis ( peroneous ) longus
calcaneus
tibialis posterior
medial cuneiform
cuboid bone
Talus
Navicular Bone
tibialis anterior
-
Related:   Palatine Bone
Highlight
Metatarsal
quadratus plantae
lumbricals
flexor hallucis longus
Flexor digitorum longus
tibialis posterior
Medial cuneiform
Proximal phalanx
calcaneus
Tibialis anterior
Navicular Bone
fibularis longus
fibularis brevis

Highlight
Metatarsal
quadratus plantae
lumbricals
flexor hallucis longus
Flexor digitorum longus
tibialis posterior
Medial cuneiform

Highlight
Proximal phalanx
calcaneus
Tibialis anterior
Navicular Bone
fibularis longus
fibularis brevis
-

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Insertion

Nearby, where the tendon divides into the lateral side of the tendon of the flexor digitorum longus, the quadratus plantae muscle enters in the proximal half of the sole of the foot.

Proximal to the origin of the lumbricals, a flattened muscular band is formed by the combining the two heads which enters into the tendon of flexor digitorum longus in the midpoint of the sole.

Quadratus Plantae

Quadratus Plantae

 

Origin

The quadratus plantae muscle is a flat quadrangular muscle with two heads of origin:

  • One of the heads originates from the medial surface of the calcaneus inferior to the sustentaculum tali.
  • The other head originates anterior to the lateral process of the calcaneal tuberosity and the attachment of the long plantar ligament, from the inferior surface of the calcaneus.

Nerve Supply

Lateral plantar nerve supplies Flexor accessorius, root value S2, S3. The skin above the area is supplied by root S1.

Action

It helps the long flexor tendons contract all the joints of the lateral four toes. It changes the direction of pull to ensure that the toes flex in the direction of the heel and not in the direction of the medial malleolus, by pulling on the lateral side of the tendon of flexor digitorum longus.

Related:   Supratrochlear artery

Functional Activity

Whenever flexor digitorum longus is already contracted because of plantar flexion of the ankle joint flexor accessorius has an important role to play in gait.

For facilitating the flexing of toes to grasp the ground providing support and thrust during the propulsive stage, this muscle applies its action on the long flexor tendons. This action basically means that flexor digitorum longus can be considered to act strongly across two joints at the same time


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By | 2018-02-01T09:36:44+00:00 August 25th, 2017|Anatomy, Lower Limb, Muscles|0 Comments