Activity 1
1. Name of Muscle: Platysma
- Origin: Fascia that envelopes over the deltoid and pectoralis major muscles
- Insertion: Mandible and skin of the lower face.
- Action: Draws outer part of lower sides of the lip inferiorly and posteriorly as in pouting.
2. Name of Muscle: Mentalis
- Origin: Mandible
- Insertion: Skin of the chin
- Action: Elevates and protrudes lower lip and pulls skin of chin up, as in pouting
3. Name of Muscle: Orbicularis Oris
- Origin: Muscle fibers surrounding the opening of the mouth.
- Insertion: Skin at corner of mouth.
- Action: Closes and protrudes lips, as in kissing; compresses lips against teeth; and shapes lips during speech.
4. Name of Muscle: Corrugator Supercilii
- Origin: Medial end of superciliary arch of frontal bone.
- Insertion: Skin of eyebrow
- Action: Draws eyebrow inferiorly and wrinkles skin of forehead vertically as in frowning
5. Name of Muscle: Orbicularis Oculi
- Origin: Medial wall of orbit.
- Insertion: Circular path around orbit.
- Action: Closes eye.
6. Name of Muscle: Occipitofrontalis
- Origin: Epicranial aponeurosis.
- Insertion: Skin superior to supraorbital margin.
- Action: Draws scalp anteriorly, raises eyebrows, and wrinkles skin of forehead horizontally as in look of surprise.
Reference:
Tortora, G. J., & Derrickson, B. H. (2017). Tortora’s Principles of Anatomy & Physiology. Wiley. https://books.google.com.ph/books?id=aSaVDwAAQBAJ&lpg=PR1&pg=PR1#v=onepage&q&f=false