ACTIVITY 1

Niñaflor Angeline D. Corpuz - Activity 1

Niñaflor Angeline D. Corpuz - Activity 1

by Niñaflor Angeline Corpuz -
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  1. Platysma

    1. Origin

      1. Originates from the fascia over the deltoid and pectoralis major

    2. Insertion

      1. Inserts to the mandible. Blends with the muscles on the angle of the mouth, as well as the skin of the lower face

    3. Action

      1. The muscle depresses the mandible, and inferiorly and posteriorly draws the outer part of the lower lip.

  2. Mentalis

    1. Origin

      1. Originates from the mandible, specifically its anterior incisive fossa

    2. Insertion

      1. Inserts to the skin of the chin

    3. Action

      1. This muscle is mainly involved in “pouting.” It elevates and pushes the lower lip forward, while also pulling the chin upwards.

  3. Orbicularis Oris

    1. Origin

      1. Originates at the muscle fibers surrounding the opening of the mouth

    2. Insertion

      1. Inserts to the skin at the corner of the mouth

    3. Action

      1. Known as the “kissing” muscle, it closes and pushes the lips forward. It also compresses the lips against the teeth, and shapes it during speech.

  4. Corrugator Supercilii

    1. Origin

      1. Originates from the medial end of the superciliary arch of the frontal bone

    2. Insertion

      1. Inserts to the skin of the eyebrow and medial forehead

    3. Action

      1. Involved in frowning; it wrinkles the forehead and draws the eyebrow inferiorly

  5. Orbicularis Oculi

    1. Origin

      1. Originates from the medial wall of the orbit

      2. Originates from the medial orbital margin and lacrimal sac

    2. Insertion

      1. Inserts to the circular path around the orbit

      2. Inserts to the lateral palpebral raphe

    3. Action

      1. Closes the eye and eyelids, and aids the passage of tears

  6. Frontal Belly

    1. Origin

      1. Originates from the epicranial aponeurosis

    2. Insertion

      1. Inserts to the skin superior to the supraorbital margin

    3. Action

      1. As seen in the image, this muscle is involved in raising the eyebrows and wrinkling the forehead. In addition, it also draws the scalp anteriorly



References:


Dauzvardis, M. F., PhD. (1996). Master Muscle List. Loyola University Medical Center -  Stritch School of Medicine. https://www.meddean.luc.edu/lumen/meded/grossanatomy/dissector/mml/ 

Tortora, G. J., & Derrickson, B. (2017). Principles of Anatomy & Physiology. http://ndl.ethernet.edu.et/bitstream/123456789/1717/1/36%2c2012.pdf.pdf