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Muscles: Psoas Major.

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Anatomy & Physiology: Muscles—Psoas Major.

Structure.

  • Origin: transverse processes and lateral bodies of the last thoracic and all lumbar vertebrae including intervertebral discs.
  • Insertion: with ilacus into lesser trochanter of the femur.
  • Of iliopsoas group.

Function.

  • Concentric action: accelerates hip flexion and external/lateral rotation; extends and rotates lumbar spine. Lesser: ipsilateral pelvic elevation.
  • Reverse mover action: trunk flexion and lateral flexion; anterior pelvic tilt; contralateral rotation of trunk and pelvis.
  • Eccentric action: controls/restrains/decelerates hip extension and internal rotation; lumbar spine extension and lateral flexion and ipsilateral rotation.
  • Isometric action: stabilization of lumbo-pelvic hip complex.
  • Innervation: spinal nerve branches of L2-L3.
  • Arterial supply: lumbar 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: Platysma.

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Anatomy & Physiology: Muscles—Platysma.

Structure.

  • Origin: skin over lower neck and upper lateral chest.
  • Insertion: inferior border of mandible and skin over lower face and angle of mouth.

Function.

  • Concentric action: draws up skin at superior chest and neck to create ridges of skin of neck; depresses and draws lower lip laterally; depresses mandible at TMJ.
  • Eccentric action:
  • Isometric action:
  • Innervation: facial VII nerve.
  • Arterial supply: facial artery and transverse cervical 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: Orbicularis Oris.

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Anatomy & Physiology: Muscles—Orbicularis Oris.

Structure.

  • Origin: muscle fibers surrounding the opening of the mouth.
  • Insertion: skin at corner of mouth.
  • Superficial.

Function.

  • Concentric action: closes and protrudes lips (like kissing); compress lips against teeth; shapes lips during speech.
  • Eccentric action:
  • Isometric action:
  • Innervation: facial VII nerve.
  • Arterial supply: facial artery.
  • “Orbicularis oris kissed a hare and a tortoise”.

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: Mentalis.

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Anatomy & Physiology: Muscles—Mentalis.

Structure.

  • Origin: mandible.
  • Insertion: skin of chin.

Function.

  • Concentric action: elevates and protrudes lower lip and pulls skin of chin (pout).
  • Eccentric action:
  • Isometric action:
  • Innervation: facial VII nerve.
  • Arterial supply: facial artery.
  • “Pouting”.

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: Depressor Anguli Oris.

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Anatomy & Physiology: Muscles—Depressor Anguli Oris.

Structure.

  • Origin: mandible.
  • Insertion: angle of mouth.
  • Superficial.

Function.

  • Concentric action: draws angle of mouth laterally and inferiorly (opening mouth).
  • Eccentric action:
  • Isometric action:
  • Innervation: facial VII nerve.
  • Arterial supply: facial artery.
  • “Depressor the frowner”.

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: Risorius.

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Anatomy & Physiology: Muscles—Risorius.

Structure.

  • Origin: fascia over parotid/salivary gland.
  • Insertion: skin at angle of mouth.
  • Superficial to buccinator and zygomaticus major-minor.

Function.

  • Concentric action: draws angle of mouth laterally.
  • Eccentric action:
  • Isometric action:
  • Innervation: facial VII nerve.
  • Arterial supply: facial artery.
  • “Risorius the grimacer”.

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: Levator Anguli Oris.

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Anatomy & Physiology: Muscles—Levator Anguli Oris.

Structure.

  • Origin: inferior to infraorbital foramen.
  • Insertion: skin of lower lip and orbicularis oris.

Function.

  • Concentric action: draws angle of mouth laterally and superiorly.
  • Eccentric action:
  • Isometric action:
  • Innervation: facial VII nerve.
  • Arterial supply: facial 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: Zygomaticus Major.

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Anatomy & Physiology: Muscles—Zygomaticus Major.

Structure.

  • Origin: zygomatic bone.
  • Insertion: skin at angle of mouth and orbicularis oris.
  • Superficial.

Function.

  • Concentric action: draws angle of mouth superiorly and laterally (smiling).
  • Eccentric action:
  • Isometric action:
  • Innervation: facial VII nerve.
  • Arterial supply: facial artery.
  • “Smile”.

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: Zygomaticus Minor.

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Anatomy & Physiology: Muscles—Zygomaticus Minor.

Structure.

  • Origin: zygomatic bone.
  • Insertion: upper lip.
  • Superficial.

Function.

  • Concentric action: raises (elevates) upper lip exposing maxillary teeth.
  • Eccentric action:
  • Isometric action:
  • Innervation: facial VII nerve.
  • Arterial supply: facial artery.
  • “Toothy grin”.

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: Levator Labii Superioris.

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Anatomy & Physiology: Muscles—Levator Labii Superioris.

Structure.

  • Origin: superior to infraorbital foramen of maxilla.
  • Insertion: skin at angle of mouth and orbicularis oris.

Function.

  • Concentric action: elevates upper lip, everts upper lip.
  • Eccentric action:
  • Isometric action:
  • Innervation: facial VII nerve.
  • Arterial supply: facial 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.