Month: February 2019

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Anatomy & Physiology: Muscles—Medial rectus.

Structure.

• Origin: orbit around optic foramen (common tendinous ring).
• Insertion: medial part of eyeball.

Function.

• Concentric action: moves eyeball medially.
• Reverse mover action:
• Eccentric action:
• Isometric action:
• Innervation: oculomotor III nerve.
• Arterial supply: branches off the opthalmic artery.

Clinical Significance.

More.

• https://www.anatomynext.com/medial-rectus/
• https://www.youtube.com/watch?v=LQlvz0GjvPo
• https://apps.medsch.ucla.edu/medyear1/Anatomy/extraocularMuscles/MedialRectus.htm

Medial rectus. 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—Lateral rectus.

Structure.

• Origin: orbit around optic foramen (common tendinous ring).
• Insertion: lateral part of eyeball.

Function.

• Concentric action: moves eyeball laterally.
• Reverse mover action:
• Eccentric action:
• Isometric action:
• Innervation: abducens VI nerve.
• Arterial supply: branches off the opthalmic artery.

Clinical Significance.

More.

• https://www.anatomynext.com/lateral-rectus/
• https://www.youtube.com/watch?v=oKLImEsp0ww
• https://apps.medsch.ucla.edu/medyear1/Anatomy/extraocularMuscles/LateralRectus.htm

Lateral rectus. 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—Superior rectus.

Structure.

• Origin: orbit around optic foramen (common tendinous ring).
• Insertion: superior and central part of eyeball.

Function.

• Concentric action: moves eyeball superiorly and medially; medial rotation.
• Reverse mover action:
• Eccentric action:
• Isometric action:
• Innervation: oculomotor III nerve.
• Arterial supply: branches off the opthalmic artery.

Clinical Significance.

More.

• https://www.anatomynext.com/superior-rectus/
• https://www.kenhub.com/en/videos/superior-rectus-anatomy
• https://apps.medsch.ucla.edu/medyear1/Anatomy/extraocularMuscles/SuperiorRectus.htm

Superior rectus. 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—Inferior rectus.

Structure.

• Origin: orbit around optic foramen (common tendinous ring).
• Insertion: inferior and central part of eyeball.

Function.

• Concentric action: moves eyeball inferiorly and medially; medial rotation.
• Reverse mover action:
• Eccentric action:
• Isometric action:
• Innervation: facial III nerve.
• Arterial supply: branches off the opthalmic artery.

Clinical Significance.

More.

• https://www.anatomynext.com/inferior-rectus/
• https://apps.medsch.ucla.edu/medyear1/Anatomy/extraocularMuscles/InferiorRectus.htm

Inferior rectus. 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 labii inferioris.

Structure.

• Origin: mandible.
• Insertion: skin of lower lip.

Function.

• Concentric action: depresses (lowers) lower lip; draws laterally the lower lip; everts lower lip.
• Reverse mover action:
• Eccentric action:
• Isometric action:
• Innervation: facial VII nerve.
• Arterial supply: facial artery (branch of the external carotid artery).

Clinical Significance.

More.

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

Depressor labii inferioris. 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.