Category: Muscles

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Muscles: Semimembranosus.

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Anatomy & Physiology: Muscles—Semimembranosus.

Structure.

  • Origin: ischial tuberosity of pelvis.
  • Insertion: posterior aspect of the medial tibial condyle of the tibia.

Function.

  • Concentric action: accelerate knee flexion, hip extension, and tibial internal/medial rotation.
  • Reverse mover action: posterior tilt pelvis; thigh flexion and lateral rotation; ipsilateral rotation and ipsilateral elevation of pelvis.
  • Eccentric action: decelerates knee extension, hip extension, and tibial external/lateral rotation.
  • Isometric action: stabilization of knee and lumbo-pelvic hip complex.
  • Innervation: tibial nerve.
  • Arterial supply: inferior gluteal artery, obturator 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: Semitendinosus.

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Anatomy & Physiology: Muscles—Semitendinosus.

Structure.

  • Origin: ischial tuberosity of pelvis, and part of the sacrotuberous ligament.
  • Insertion: proximal aspect of the medial tibial condyle (pes anserine).

Function.

  • Concentric action: accelerate knee flexion, hip extension, and tibial internal/medial rotation.
  • Reverse mover action: posterior pelvic tilt; ipsilateral rotation and ipsilateral elevation of pelvis; thigh flexion, lateral rotation.
  • Eccentric action: decelerates knee extension, hip flexion, and tibial external rotation.
  • Isometric action: stabilization of the knee and lumbo-pelvic hip complex.
  • Innervation: tibial nerve.
  • Arterial supply: inferior gluteal artery, obturator 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: Biceps Femoris.

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Anatomy & Physiology: Muscles—Biceps Femoris, Long Head.

Structure.

  • Long Head
    • Origin: ischial tuberosity of the pelvis, part of the sacrotuberous ligament.
    • Insertion: head of the fibula; lateral condyle of tibia.
  • Short Head
    • Origin: lower 1/3 of the posterior aspect (linea aspera) of the femur.
    • Insertion: head of the fibula; lateral condyle of tibia.

Function.

  • Concentric action: Long head—accelerate knee flexion, hip extension, and tibial external/lateral rotation. Short head— accelerate knee flexion and tibial external rotation.
  • Reverse mover action: contralateral rotation, ipsilateral elevation, and posteior tilt of pelvis. Thigh flexion, medial rotation.
  • Eccentric action: Long head—decelerates knee extension, hip flexion, and tibial internal/medial rotation. Short head— accelerate knee flexion and tibial external rotation.
  • Isometric action: stabilization of lumbo-pelvic hip complex and knee.
  • Innervation: tibial nerve from sciatic.
  • Arterial supply: Long head—inferior gluteal artery, perforating branches of deep femoral artery, obturator artery. Short head—perforating branches of deep femoral artery, 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: Articularis Genus.

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Anatomy & Physiology: Muscles—Articularis Genus.

Structure.

  • Origin: anterior distal femoral shaft.
  • Insertion: knee joint capsule.

Function.

  • Concentric action: tense and pull knee joint capsule proximally.
  • Reverse mover action:
  • Eccentric action: controls/restrains/decelerates distal movement of knee joint capsule.
  • Isometric action: stabilization of the knee.
  • Innervation: femoral nerve.
  • Arterial supply: deep femoral 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: Vastus Intermedius.

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Anatomy & Physiology: Muscles—Vastus Intermedius.

Structure.

  • Origin: anterior and lateral surfaces of femur.
  • Insertion: base of patella, tibial tuberosity.

Function.

  • Concentric action: accelerate knee extension.
  • Reverse mover action: thigh extension.
  • Eccentric action: decelerates knee flexion.
  • Isometric action: stabilization of the knee.
  • Innervation: femoral nerve.
  • Arterial supply: deep femoral 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: Vastus Medialis.

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Anatomy & Physiology: Muscles—Vastus Medialis.

Structure.

  • Origin: linea aspera of femur.
  • Insertion: base of patella, tibial tuberosity.

Function.

  • Concentric action: accelerate knee extension.
  • Reverse mover action: thigh extension.
  • Eccentric action: decelerates knee flexion.
  • Isometric action: stabilization of the knee.
  • Innervation: femoral nerve.
  • Arterial supply: femoral 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: Vastus Lateralis.

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Anatomy & Physiology: Muscles—Vastus Lateralis.

Structure.

  • Origin: greater trochanter and linea aspera of femur.
  • Insertion: patella via quadriceps tendon and tibial tuberosity via patellar ligament.

Function.

  • Concentric action: accelerate knee flexion.
  • Reverse mover action: thigh extension.
  • Eccentric action: decelerates knee extension.
  • Isometric action: stabilization of the knee.
  • Innervation: femoral nerve.
  • Arterial supply: femoral artery, 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: Rectus Femoris.

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Anatomy & Physiology: Muscles—Rectus Femoris.

Structure.

  • Origin: anteroinferior iliac spine of the pelvis.
  • Insertion: base of patella, tibial tuberosity.

Function.

  • Concentric action: accelerate knee extension and hip flexion.
  • Reverse mover action: thigh extension and anterior pelvic tilt.
  • Eccentric action: decelerates knee flexion and hip extension.
  • Isometric action: stabilization of the knee and lumbo-pelvic hip complex.
  • Innervation: femoral nerve.
  • Arterial supply: femoral 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: Quadratus Femoris.

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Anatomy & Physiology: Muscles—Quadratus Femoris.

Structure.

  • Origin: ischial tuberosity.
  • Insertion: superior to mid-portion of intertrochanteric crest (quadrate tubercle) on posterior femur.
  • Of deep lateral rotator group.

Function.

  • Concentric action: lateral rotation.
  • Reverse mover action: contralateral rotation of pelvis.
  • Eccentric action: decelerates internal/medial rotation.
  • Isometric action: stabilization hip and sacroiliac joints.
  • Innervation: nerve to quadratus femoris.
  • Arterial supply: inferior gluteal artery, obturator 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: Obturator Externus.

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Anatomy & Physiology: Muscles—Obturator Externus.

Structure.

  • Origin: inner surface of obturator membrane.
  • Insertion: deep depression inferior to greater tochanter (trochanteric fossa) of femur.
  • Of deep lateral rotator group.

Function.

  • Concentric action: accelerates abduction, and external/lateral rotation.
  • Reverse mover action: contralateral rotation of pelvis.
  • Eccentric action: decelerates adduction and internal/medial rotation.
  • Isometric action: stabilization hip and sacroiliac joints.
  • Innervation: obturator nerve.
  • Arterial supply: obturator 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.