ACTIVITY 1

AYUYAO, Louisse Julianna P_Activity 1

AYUYAO, Louisse Julianna P_Activity 1

by Louisse Julianna Ayuyao -
Number of replies: 0
MUSCLE ORIGIN INSERTION ACTION
1. Platysma

Fascia over deltoid and
pectoralis major muscle

Mandible, blends with
muscles around angle of
mouth, and skin of lower
face

Draws outer part of lower lip inferiorly
and posteriorly, depresses
mandible
2. Mentalis Mandible Skin of chin

Elevates and protrudes lower lip,
pulls skin of chin up
3. Orbicularis oris

Muscle fibers surrounding
opening of mouth

 Skin at corner of mouth

Closes and protrudes lips,
compresses lips against teeth, 
shapes lips during speech
4. Corrugator supercilii

Medial end of superciliary
arch of frontal bone

 Skin of eyebrow

Draws eyebrow inferiorly,
wrinkles skin of forehead
vertically
5. Orbicularis oculi Medial wall of orbit

Circular path around orbit

 Closes eye
6. Occipitofrontalis (Frontal belly) Epicranial aponeurosis

Skin superior to
supraorbital margin

Draws scalp anteriorly, raises eyebrows,
wrinkles skin of forehead
horizontally 

 

Tortora, G. J., & Derrickson, B. H. (2018). Principles of anatomy and physiology. John Wiley & Sons