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 - pulling down the mandible, which opens the mouth, and pulling the corners of the lips out to the side and down, which forms a frown
2. Mentalis
Origin - Mandible
Insertion - Skin of chin
Action - Elevates and protrudes lower lip and pulls skin of chin up, as in pouting
3. Orbicularis oris
Origin - Muscle fibers surrounding opening of mouth
Insertion - Skin at corner of mouth
Action - Closes and protrudes lips, as in kissing
4. Procerus
Origin - Nasal bone, (superior part of) lateral nasal cartilage
Insertion - Skin of glabella, fibers of frontal belly of occipitofrontalis muscle
Action - Depresses medial end of eyebrow, wrinkles skin of glabella
5. Orbicularis oculi
Origin - Medial wall of orbit
Insertion - Circular path around orbit
Action - Closes eye
6. Occipitofrontalis
Origin - Epicranial aponeurosis
Insertion - Skin superior to supraorbital margin
Action - Draw scalp anteriorly, raises, eyebrows, and wrinkles skin of forehead horizontally as in look of surprise
9/8/23 11:22 PM
NOTE: Ma'am I was supposed to edit the post but the timer ran out. My apologies.
Origin - Fascia over deltoid and pectoralis major muscles
Insertion - Mandible, blends with muscles around angle of mouth, and skin of lower face
Action - pulling down the mandible, which opens the mouth, and pulling the corners of the lips out to the side and down, which forms a frown
2. Mentalis
Origin - Mandible
Insertion - Skin of chin
Action - Elevates and protrudes lower lip and pulls skin of chin up, as in pouting
3. Orbicularis oris
Origin - Muscle fibers surrounding opening of mouth
Insertion - Skin at corner of mouth
Action - Closes and protrudes lips, as in kissing
4. Procerus
Origin - Nasal bone, (superior part of) lateral nasal cartilage
Insertion - Skin of glabella, fibers of frontal belly of occipitofrontalis muscle
Action - Depresses medial end of eyebrow, wrinkles skin of glabella
5. Orbicularis oculi
Origin - Medial wall of orbit
Insertion - Circular path around orbit
Action - Closes eye
6. Occipitofrontalis
Origin - Epicranial aponeurosis
Insertion - Skin superior to supraorbital margin
Action - Draw scalp anteriorly, raises, eyebrows, and wrinkles skin of forehead horizontally as in look of surprise
9/8/23 11:22 PM
NOTE: Ma'am I was supposed to edit the post but the timer ran out. My apologies.