ACTIVITY 1

Sabinay, Gillian Trishabelle A.

Sabinay, Gillian Trishabelle A.

by Gillian Trishabelle Sabinay -
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: Draws outer part of lips inferiorly and posteriorly, depresses mandible


  1. Mentalis

    • Origin: Mandible

    • Insertion: Skin of chin

    • Action: Elevates and protrudes lower lip and pulls skin of chin up


  1. Buccinator

    • Origin: Alveolar processes of maxilla and mandible and pterygomandibular raphe

    • Insertion: Orbicularis oris

    • Action: Presses cheeks against teeth and lips, draws corners of the mouth laterally, and assists in mastication


  1. Corrugator supercilii

    • Origin: Medial and superciliary arch of frontal bone

    • Insertion: Skin of eyebrow

    • Action: Draws eyebrow inferiorly and wrinkles skin of forehead vertically


  1. Orbicularis oculi

    • Origin: Medial wall of orbit

    • Insertion: Circular path around orbit

    • Action: Closes eye


  1. Occipitofrontalis (Frontal belly)

    • Origin: Epicranial aponeurosis

    • Insertion: Skin superior to supraorbital margin

  • Action: Draws scalp anteriorly, raises eyebrows, and wrinkles skin of forehead

Reference used:

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.