Category: Muscles

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Muscles: Extensor Digitorum Longus.

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Anatomy & Physiology: Muscles—Extensor Digitorum Longus.

Structure.

  • Origin: lateral condyle of tibia, anterior fibula, interosseous membrane.
  • Insertion: middle and distal phalanges of toes II-V.

Function.

  • Concentric action: ankle dorsiflexion, extension of distal and middle phalanges of toes at interphalangeal joints and proximal phalanx of each toe at metatarsophalangeal joint.
  • Reverse mover action: dorsiflexion; eversion/pronation of talus at subtalar joint; estend metatarsals at MTP joints and extension of the more proximal phalanges at the IP joints.
  • Eccentric action: controls/restrains/decelerates flexion of toes 2-5 at MTP and IP joints; metatarsals 2-5 at MTP joints; plantarflexion; inversion/supination at subtalar joint.
  • Isometric action: stabilizes ankle, subtalar and MTP and IP joints.
  • Innervation: deep fibular (peroneal) nerve.
  • Arterial supply: anterior tibial artery.

Clinical Significance.

More.

References

Biel, A. (2015). Trail guide to the body: A hands-on guide to locating muscles, bones and more.

Clark, M., Lucett, S., Sutton, B. G., & National Academy of Sports Medicine. (2014). NASM essentials of corrective exercise training. Burlington, MA: Jones & Bartlett Learning.

Jenkins, G., & Tortora, G. J. (2012). Anatomy and Physiology: From Science to Life, 3rd Edition International Stu. John Wiley & Sons.

Muscolino, J. E. (2017). The muscular system manual: The skeletal muscles of the human body.

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Muscles: Tibialis Posterior.

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Anatomy & Physiology: Muscles—Tibialis Posterior.

Structure.

  • Origin: proximal 2/3 of posterior surface of the tibia and fibula.
  • Insertion: every tarsal bone except the talus; the bases of the 2nd-4th metatarsal bones; main insertion on navicular tuberosity & medial cuneiform.

Function.

  • Concentric action: ankle plantar flexion & inversion.
  • Reverse mover action: plantarflexion; inversion/supination of talus at subtalar joint.
  • Eccentric action: ankle dorsiflexion and eversion.
  • Isometric action: stabilization of foot arch.
  • Innervation: tibial nerve.
  • Arteral supply: posterior tibial artery.

Clinical Significance.

More.

References

Biel, A. (2015). Trail guide to the body: A hands-on guide to locating muscles, bones and more.

Clark, M., Lucett, S., Sutton, B. G., & National Academy of Sports Medicine. (2014). NASM essentials of corrective exercise training. Burlington, MA: Jones & Bartlett Learning.

Jenkins, G., & Tortora, G. J. (2012). Anatomy and Physiology: From Science to Life, 3rd Edition International Stu. John Wiley & Sons.

Muscolino, J. E. (2017). The muscular system manual: The skeletal muscles of the human body.

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Muscles: Plantaris.

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Anatomy & Physiology: Muscles—Plantaris.

Structure.

  • Origin: femur superior to lateral condyle.
  • Insertion: calcaneus via Achilles tendon.

Function.

  • Concentric action: accelerates plantar flexion.
  • Reverse mover action: plantarflexion inversion/supination of talus at subtalar joint.
  • Eccentric action: decelerates ankle dorsiflexion.
  • Isometric action: stabilization of foot and ankle.
  • Innervation: tibial nerve.
  • Arterial supply: sural branches of popliteal artery.

Clinical Significance.

More.

References

Biel, A. (2015). Trail guide to the body: A hands-on guide to locating muscles, bones and more.

Clark, M., Lucett, S., Sutton, B. G., & National Academy of Sports Medicine. (2014). NASM essentials of corrective exercise training. Burlington, MA: Jones & Bartlett Learning.

Jenkins, G., & Tortora, G. J. (2012). Anatomy and Physiology: From Science to Life, 3rd Edition International Stu. John Wiley & Sons.

Muscolino, J. E. (2017). The muscular system manual: The skeletal muscles of the human body.

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Muscles: Soleus.

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Anatomy & Physiology: Muscles—Soleus.

Structure.

  • Origin: posterior surface of the fibular head and proximal one-third of its shaft and from the posterior side of the tibia.
  • Insertion: calcaneus via Achilles tendon.

Function.

  • Concentric action: accelerates plantar flexion.
  • Reverse mover action: plantarflexion; inversion/supination of talus at subtalar joint.
  • Eccentric action: decelerates ankle dorsiflexion.
  • Isometric action: stabilization of foot and ankle.
  • Innervation: tibial nerve.
  • Arterial supply: sural branches of popliteal artery.

Clinical Significance.

More.

References

Biel, A. (2015). Trail guide to the body: A hands-on guide to locating muscles, bones and more.

Clark, M., Lucett, S., Sutton, B. G., & National Academy of Sports Medicine. (2014). NASM essentials of corrective exercise training. Burlington, MA: Jones & Bartlett Learning.

Jenkins, G., & Tortora, G. J. (2012). Anatomy and Physiology: From Science to Life, 3rd Edition International Stu. John Wiley & Sons.

Muscolino, J. E. (2017). The muscular system manual: The skeletal muscles of the human body.

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Muscles: Gastrocnemius.

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Anatomy & Physiology: Muscles—Gastrocnemius.

Structure.

  • Origin: posterior aspect of the lateral and medial femoral condyles.
  • Insertion: calcaneus via the Achilles tendon.

Function.

  • Concentric action: accelerates plantar flexion.
  • Reverse mover action: plantarflexion, inversion/supination of the talus at subtalar joint.
  • Eccentric action: decelerates ankle dorsiflexion.
  • Isometric action: stabilization of foot and ankle.
  • Innervation: tibial nerve.
  • Arterial supply: sural branches of popliteal artery.

Clinical Significance.

More.

References

Biel, A. (2015). Trail guide to the body: A hands-on guide to locating muscles, bones and more.

Clark, M., Lucett, S., Sutton, B. G., & National Academy of Sports Medicine. (2014). NASM essentials of corrective exercise training. Burlington, MA: Jones & Bartlett Learning.

Jenkins, G., & Tortora, G. J. (2012). Anatomy and Physiology: From Science to Life, 3rd Edition International Stu. John Wiley & Sons.

Muscolino, J. E. (2017). The muscular system manual: The skeletal muscles of the human body.

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Muscles: Fibularis Brevis.

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Anatomy & Physiology: Muscles—Fibularis (Peroneus) Brevis.

Structure.

  • Origin: body of fibula.
  • Insertion: base of metatarsal V.

Function.

  • Concentric action: plantar flexion; eversion at intertarsal joints.
  • Reverse mover action: evert/pronates talus at subtalar joint.
  • Eccentric action: controls/restrains/decelerates inversion/supination at subtalar joint; ankle dorsiflexion.
  • Isometric action: stabilization of ankle and subtalar joints.
  • Innervation: superficial fibular (peroneal) nerve.
  • Arterial supply: fibular artery.

Clinical Significance.

More.

References

Biel, A. (2015). Trail guide to the body: A hands-on guide to locating muscles, bones and more.

Clark, M., Lucett, S., Sutton, B. G., & National Academy of Sports Medicine. (2014). NASM essentials of corrective exercise training. Burlington, MA: Jones & Bartlett Learning.

Jenkins, G., & Tortora, G. J. (2012). Anatomy and Physiology: From Science to Life, 3rd Edition International Stu. John Wiley & Sons.

Muscolino, J. E. (2017). The muscular system manual: The skeletal muscles of the human body.

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Muscles: Fibularis Longus.

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Anatomy & Physiology: Muscles—Fibularis (Peroneus) Longus.

Structure.

  • Origin: fibular head and body; lateral condyle of tibia.
  • Insertion: metatarsal I and first cuneiform.

Function.

  • Concentric action: plantar flexion; eversion.
  • Reverse mover action: evert talus at subtalar joint; plantar flexion.
  • Eccentric action: decelerates ankle dorsiflexion and inversion.
  • Isometric action: stabilization of foot and ankle.
  • Innervation: superficial fibular (peroneal) nerve.
  • Arterial supply: fibular artery.

Clinical Significance.

More.

References

Biel, A. (2015). Trail guide to the body: A hands-on guide to locating muscles, bones and more.

Clark, M., Lucett, S., Sutton, B. G., & National Academy of Sports Medicine. (2014). NASM essentials of corrective exercise training. Burlington, MA: Jones & Bartlett Learning.

Jenkins, G., & Tortora, G. J. (2012). Anatomy and Physiology: From Science to Life, 3rd Edition International Stu. John Wiley & Sons.

Muscolino, J. E. (2017). The muscular system manual: The skeletal muscles of the human body.

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Muscles: Fibularis Tertius.

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Anatomy & Physiology: Muscles—Fibularis (Peroneus) Tertius.

Structure.

  • Origin: distal third of fibula and interosseous membrane.
  • Insertion: base of metatarsal V.

Function.

  • Concentric action: dorsiflexion; eversion at intertarsal joints.
  • Reverse mover action: dorsiflexion and eversion (at talus).
  • Eccentric action: controls/restrains/decelerates ankle plantarflexion, supination at subtalar joint.
  • Isometric action: stabilize ankle and subtalar joints.
  • Innervation: deep fibular (peroneal) nerve.
  • Arterial supply: anterior tibial artery.

Clinical Significance.

 

References

Biel, A. (2015). Trail guide to the body: A hands-on guide to locating muscles, bones and more.

Clark, M., Lucett, S., Sutton, B. G., & National Academy of Sports Medicine. (2014). NASM essentials of corrective exercise training. Burlington, MA: Jones & Bartlett Learning.

Jenkins, G., & Tortora, G. J. (2012). Anatomy and Physiology: From Science to Life, 3rd Edition International Stu. John Wiley & Sons.

Muscolino, J. E. (2017). The muscular system manual: The skeletal muscles of the human body.

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Muscles: Tibialis Anterior.

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Anatomy & Physiology: Muscles—Tibialis Anterior.

Structure.

  • Origin: lateral condyle & proximal 2/3 of lateral surface of tibia.
  • Insertion: medial & plantar aspects of the medial cuneiform & base of first metatarsal.

Function.

  • Concentric action: ankle dorsiflexion; inversion.
  • Reverse mover action: dorsiflex and invert (supinate) talus.
  • Eccentric action: ankle plantar flexion & eversion.
  • Isometric action: stabilization of foot arch.
  • Innervation: deep peroneal (aka fibular) nerve.
  • Arterial supply: anterior tibial artery.

Clinical Significance.

More.

References

Biel, A. (2015). Trail guide to the body: A hands-on guide to locating muscles, bones and more.

Clark, M., Lucett, S., Sutton, B. G., & National Academy of Sports Medicine. (2014). NASM essentials of corrective exercise training. Burlington, MA: Jones & Bartlett Learning.

Jenkins, G., & Tortora, G. J. (2012). Anatomy and Physiology: From Science to Life, 3rd Edition International Stu. John Wiley & Sons.

Muscolino, J. E. (2017). The muscular system manual: The skeletal muscles of the human body.

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Muscles: Popliteus.

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Anatomy & Physiology: Muscles—Popliteus.

Structure.

  • Origin: lateral condyle of femur.
  • Insertion: proximal tibia.

Function.

  • Concentric action: knee flexion; medial rotation of tibia to unlock and extend knee.
  • Reverse mover action: lateral rotation and flexion of thigh.
  • Eccentric action: controls/restrains/decelerates lateral and medial rotation of leg (at knee joint); knee extension.
  • Isometric action: stabilization of knee.
  • Innervation: tibial nerve.
  • Arterial supply: popliteal artery.

Clinical Significance.

More.

References

Biel, A. (2015). Trail guide to the body: A hands-on guide to locating muscles, bones and more.

Clark, M., Lucett, S., Sutton, B. G., & National Academy of Sports Medicine. (2014). NASM essentials of corrective exercise training. Burlington, MA: Jones & Bartlett Learning.

Jenkins, G., & Tortora, G. J. (2012). Anatomy and Physiology: From Science to Life, 3rd Edition International Stu. John Wiley & Sons.

Muscolino, J. E. (2017). The muscular system manual: The skeletal muscles of the human body.