A And P Muscles

Front 1

Epicranius
Frontal and Occipital Belly

Back 1

Origin: galea aponeurotica
Insertion: skin of eyebrows and root of nose
Action: raises eyebrows and pulls scalp posteriorly

Front 2

Orbicularis Oculi

Back 2

Origin: Frontal and maxillary bones and ligaments around orbit
Insertion: Encicles orbit and inserts in tissue of eyelid
Action: closes eye

Front 3

Corrugator Supercilii

Back 3

Origin: arch of frontal bone above the nasal bone
Insertion: skin of eyebrow
Action: draws eyebrows medially and inferiorly, wrinkles skin of forehead vertically

Front 4

Levator Labii Superioris

Back 4

Origin: Zygomatic bone and infraorbital margin of maxilla
Insertion: skin and muscle of upper lip and border of nostril
Action: Raises and furrows upper lip and opens lips

Front 5

Zygomaticus- major and minor

Back 5

Origin: Zygomatic bone
Insertion: Skin and muscle at corner of mouth
Action: raises lateral corners of mouth upward (smiling muscle)

Front 6

Risorius

Back 6

Origin: Fascia of masseter muscle
Insertion: Skin of angle of mouth
Action: Draws corners of lip laterally; tense lip; zygomaticus synergist

Front 7

Depressor labii inferioris

Back 7

Origin: Body of Mandible lateral to its midline
Insertion: Skin and muscle of lower lip
Action: Draws lower lip inferiorly

Front 8

Depressor anguli oris

Back 8

Origin:Body of mandible below incisiors
Insertion:Skin and muscle at angle of mouth below insertion of zygomaticus
Action: Zygomaticus antagonist; draws corners of mouth downward and laterally.

Front 9

Orbicularis oris

Back 9

Origin: Arises indirectly from maxilla and mandible ; fibers blended with fibers of other muscles associated with lips
Insertion: Encircles mouth; inserts into muscle and skin at angles of mouth.
Action: Closes mouth; purses and protrudes lips (kissing and whistling muscle)

Front 10

Mentalis

Back 10

Origin: Mandible below incisors
Insertion: Skin of chin
Action: Protrudes lower lip; wrinkles chin