Category: Muscles

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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.

• http://anatomyzone.com/tutorials/musculoskeletal/muscles-of-facial-expression/
• https://www.anatomynext.com/risorius/

Risorius. Used with permission by 3D4Medical.

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.

Download these notes.

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.

• http://anatomyzone.com/tutorials/musculoskeletal/muscles-of-facial-expression/
• https://www.anatomynext.com/levator-anguli-oris/

Levator anguli oris. Used with permission by 3D4Medical.

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.

Download these notes.

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.

• http://anatomyzone.com/tutorials/musculoskeletal/muscles-of-facial-expression/
• https://www.anatomynext.com/zygomaticus-major/

Zygomaticus major. Used with permission by 3D4Medical.

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.

Download these notes.

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.

• http://anatomyzone.com/tutorials/musculoskeletal/muscles-of-facial-expression/
• https://www.anatomynext.com/zygomaticus-minor/

Zygomaticus minor. Used with permission by 3D4Medical.

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.

Download these notes.

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.

• http://anatomyzone.com/tutorials/musculoskeletal/muscles-of-facial-expression/
• https://www.anatomynext.com/levator-labii-superioris/

Levator labii superioris. Used with permission by 3D4Medical.

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.

Download these notes.

Anatomy & Physiology: Muscles—Levator Labii Superioris Alaeque Nasi.

Structure.

• Origin: front of maxilla.
• Insertion: skin upper lip and lateral nostril.

Function.

• Concentric action: raises upper lip, flares nostril, everts upper lip.
• Eccentric action:
• Isometric action:
• Innervation: facial VII nerve.
• Arterial supply: infraorbital artery.

Clinical Significance.

Levator labii superioris alaeque. Used with permission by 3D4Medical.

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.

Download these notes.

Anatomy & Physiology: Muscles—Depressor Septi Nasi.

Structure.

• Origin: incisive fossa of maxilla.
• Insertion: nasal septum and posterior alar.

Function.

• Concentric action: constricts nostril.
• Reverse mover action:
• Eccentric action:
• Isometric action:
• Innervation: facial nerve.
• Arterial supply: facial artery.

Clinical Significance.

Depressor septi nasi. Used with permission by 3D4Medical.

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.

Download these notes.

Anatomy & Physiology: Muscles—Nasalis.

Structure.

• Origin: maxilla.
• Insertion: nasal cartilage.
• Alar and transverse parts.

Function.

• Concentric action: flares nostrils, constricts nostrils.
• Reverse mover action:
• Eccentric action:
• Isometric action:
• Innervation: facial nerve.
• Arterial supply: facial artery.

Clinical Significance.

Nasalis. Used with permission by 3D4Medical.

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.

Download these notes.

Anatomy & Physiology: Muscles—Procerus.

Structure.

• Origin: midline of nasal bone and nasal cartilage.
• Insertion: skin between the eyebrows on the forehead and into the occipitofrontalis.
• Shaped like a pyramid.

Function.

• Concentric action: wrinkle skin of nose upward; draws medial eyebrow downward.
• Reverse mover action:
• Eccentric action:
• Isometric action:
• Innervation: facial nerve.
• Arterial supply: facial 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.

Download these notes.

Anatomy & Physiology: Muscles—Corrugator Supercilii.

Structure.

• Origin: medial end of superciliary arch of frontal bone.
• Insertion: skin of eyebrow.

Function.

• Concentric action: moves eyebrows inferiorly and medial; and wrinkles skin of forehead vertically (frown).
• Eccentric action:
• Isometric action:
• Innervation: facial nerve VII, temporal branch.
• Arterial supply: supratrochlear and supraorbital arteries.

Clinical Significance.

More.

• https://www.anatomynext.com/corrugator-supercilii/
• https://www.youtube.com/watch?v=2Nuja7DqKrw

Corrugator supercilii. Used with permission by 3D4Medical.

References

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

Cedars-Sinai. (2018). Vertebrae of the spine. Retrieved from https://www.cedars-sinai.org/health-library/diseases-and-conditions/v/vertebrae-of-the-spine.html

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.