ACTIVITY 1

UBANDO, Aiah Ezra M. (Activity 1)

UBANDO, Aiah Ezra M. (Activity 1)

by Aiah Ezra Ubando -
Number of replies: 0

  1. Platysma: 

  • Origin: Fascia over deltoid and pectoralis major muscles

  • Insertion: Mandible, blends with muscles around angle of mouth, and skin of lower face.

  • Action: It draws the outer part of the lower lip inferiorly and posteriorly; depresses the mandible and wrinkles the neck.

 

  1. Mentalis:

  • Origin: Mandible

  • Insertion: Skin of chin

  • Action: It elevates and protrudes the lower lip and pulls the skin of chin up, as in pouting.

  1. Orbicularis oris: 

  • Origin: Muscle fibers surrounding the opening of mouth

  • Insertion: Skin at corner of mouth

  • Action: Closes and protrudes lips, as in kissing; compresses lips against teeth; and shapes lips during speech.

  1. Corrugator supercilii:

  • Origin: Medial end of superciliary arch of the frontal bone

  • Insertion: Skin of eyebrow

  • Action: It draws eyebrows inferiorly and wrinkles the skin of the forehead vertically as in frowning.

  1. Orbicularis oculi: 

  • Origin: Medial wall of orbit

  • Insertion: Circular path around orbit

  • Action: It closes the eye (blinking and squinting).

  1. Frontal belly (Occipitofrontalis):

  • Origin: Epicranial aponeurosis

  • Insertion: Skin superior to supraorbital margin

  • Action: It draws the scalp anteriorly, raises eyebrows, and wrinkles the skin of the forehead. 

References:

Sykes, J. M., Suarez, G., Trevidic, P., Cotofona, S., & Moon, H. J. (2018). Applied facial anatomy. Master Techniques in Facial Rejuvenation (2nd ed., pp. 6-14). Elsevier. https://doi.org/10.1016/B978-0-323-35876-7.00002-9

Tortora, G. J., & Derrickson, B. (2017). Principles of Anatomy and Physiology (15th ed.). John Wiley & Sons, Inc.