ACTIVITY 1

ACTIVITY 1

ACTIVITY 1

by Jan Winston Karlo Lejano -
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  1. Platysma

  • Origin: Fascia that covers the clavicle, the acromial region, and the superior portions of the pectoralis major and deltoid muscles

  • Insertion: Mandible and the skin and subcutaneous tissue of the lower face

  • Action: Draws the corners of the mouth inferiorly and widen it, as in expressions of sadness and fright; draws the skin of the neck superiorly when teeth are clenched

Mentalis

  • Origin: Mandible's incisive fossa

  • Insertion: Skin of the chin

  • Action: Elevates and protrudes the lower lip and pull up the skin of the chin, as in pouting

Orbicularis oris

  • Origin: Midline of the mandible, which is the bone of the lower jaw, and the maxilla, which is the bone of the upper jaw

  • Insertion: Skin overlying the circumference of the orbit, the orbital septum, the temporal aspect of the orbit, and inferiorly towards the cheek

  • Action: Closes and protrudes the lips, compress lips against teeth, and shape lips during speech

Corrugator supercilii

  • Origin: Medial end of the superciliary arch of frontal bone, cranially to the root of the nose

  • Insertion: Skin of the eyebrow above the middle part of the supraorbital margin

  • Action: Draws the two eyebrows together medially and inferiorly, thereby producing vertical wrinkles over the glabella and an expression of frowning

Orbicularis oculi

  • Origin: Nasal portion of frontal bone, frontal process of maxilla, medial palpebral ligament, and the lacrimal bone

  • Insertion: Lateral palpebral raphe and superior and inferior tarsal plates, which are also known as the eyelids

  • Action: Closes the eye

Frontalis

  • Origin: Galea aponeurotica (epicranial aponeurotis)

  • Insertion: Eyebrow dermis and terminates laterally at the temporal ridge

  • Action: Raises eyebrows & wrinkles forehead as it draws scalp back

 

Reference

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