ACTIVITY 1

PADUA, Jiliane Frances M. - Activity 1

PADUA, Jiliane Frances M. - Activity 1

by Jiliane Frances Padua -
Number of replies: 0

The first expression shown uses the Platysma muscle. Its origin comes from the fascia over deltoid and pectoralis major muscles. Its insertion is mandible and blends with muscles around the angle of the mouth and skin of the lower face. The action draws outer part of the lower lip inferiorly and posteriorly as in pouting; depresses mandible.

The second expression shown uses the Mentalis muscle. Its origin comes from the mandible. Its insertion is at the skin of chin. Its action elevates and protrudes lower lip and pulls skin of chin up, as in pouting.

The third expression shown uses the Orbicularis oris muscle. Its origin comes from the muscle fibers surrounding the opening of mouth. Its insertion is at the skin at corner of mouth. Its action loses and protrudes lips, as in kissing; compresses lips against teeth; and shapes lips during speech.

The fourth expression shown uses the Corrugator supercilii muscle. Its origin comes from the medial end of superciliary arch of the frontal bone. Its insertion is at the skin of eyebrow. Its action draws eyebrows inferiorly and wrinkles the skin of the forehead vertically as in frowning.

The fifth expression shown uses the Orbicularis oculi muscle. Its origin comes from the medial wall of orbit. Its insertion is the circular path around orbit. Its action closes the eye.

The sixth and final expression shown uses the Occipitofrontalis (frontal belly) muscle. Its origin comes from the epicranial aponeurosis. Its insertion is at the skin superior to supraorbital margin. Its action draws the scalp anteriorly, raises eyebrows, and wrinkles the skin of the forehead.

 

References:

Tortora, G. J., & Derrickson, B. H. (2017). Principles of Anatomy and Physiology (15th ed.). Wiley. Retrieved from https://handoutset.com/wp-content/uploads/2022/05/Principles-of-anatomy-and-physiology-Wiley-2017-Derrickson-Bryan-H._-Tortora-Gerard-J..pdf.