Muscles of Facial expressions

Question 1

Orbicularis Oculi

Answer 1

Origin: Medial orbital margin, Palpebral ligament, Lacrimal Bone,
Insertion: Skin around the orbit, Palpebral ligament, upper and lower eyelids
Action: Closes the eyelid

Question 2

Frontalis

Answer 2

Origin: Epi-cranial Aponeurosis at the level of the coronal suture
Insertion: Skin of Frontal region, epicranial aponeurosis
Action: Horizontally wrinkles the skin of the forehead and raises the eyebrows

Question 3

Occipitalis

Answer 3

O: Lateral 2/3 of superior nuchal line and mastoid process
I: Skin of occipital region, epicranial aponeurosis
A: Moves scalp backwards

Question 4

Corrugator Supercilii

Answer 4

O: Medial end of the superciliary arch of the frontal bone
I: Skin of the medial half of the eyebrow
A: Draws eyebrows downwards and medially, produces wrinkle of the skin between the eyebrows

Question 5

Levator Palpebrae Superioris

Answer 5

O: Lesser wing of the sphenoid bone, anterior to the optic canal
I: Superior Tarsal plate
A: Raises upper eyelid

Question 6

Procerus

Answer 6

O: Fascia covering the lower parts of the nasal bone and upper part of lateral nasal cartilage
I: Skin between and above eyebrows
A: Draws down the medial angle of eyebrows, produces transverse wrinkles over the bridge of the nose

Question 7

Nasalis

Answer 7

O: Alar: Maxilla, Lateral to the lower part of the nose, Transverse: Maxilla, Lateral to the upper part of the nose
I: the opposite side nasalis over the upper cartilage of the nose
A: Draws ala off nose towards septum and compresses nostrils; alar portion opens nostrils
( Flares and constricts the nostrils)

Question 8

If the Depressor Septi Nasi originates from the incisive fossa of the maxilla and inserts into the septum and alar cartilage of the nose, what is the action?

Answer 8

It constricts the nostrils

Question 9

Levator Labii Superioris Alaeque Nasi

Answer 9

O: Frontal process of the maxilla near the nasal bone
I: Lateral slip: the muscular substance of the lateral part of the upper lip.
Medial slip: the alar cartilage and skin/ fascia of the nose
A: Flares the nostrils (Elevates the nasal ala), elevates and protrudes the upper lip. A strong bilateral contraction wrinkles the nose

Question 10

Zygomaticus Minor

Answer 10

Origin: zygomatic bone near zygomaticomaxillary suture
Insertion: the muscular substance of the upper lip
Action: elevates the upper lip

Question 11

Levator Labii Superioris

Answer 11

Origin: inferior orbital margin of the maxilla
Insertion: the muscular substance of the upper lip
Action: bilateral contraction will elevate and protrude the upper lip. Unilaterally will curl the upper lip exposing the canine tooth

Question 12

Zygomaticus Major

Answer 12

Origin: zygomatic bone near the zygomaticotemporal suture
Insertion: Modiolus, just lateral to the angle of the mouth
Action: elevates the angle of the mouth

Question 13

Levator Anguli Oris

Answer 13

O: Canine fossa of the maxilla (just inferior to the infraorbital foramen)
I: Modiolus, just lateral to the angle of the mouth
A: Elevates the angle of the mouth

Question 14

Risorius

Answer 14

Origin: fascia and skin superficial to masseter
Insertion: Modiolus
Action: draws the angle of the mouth laterally

Question 15

Depressor Anguli Oris

Answer 15

Origin: oblique line of the mandible, inferior the mental foramen
Insertion: Modiolus
Action: Depresses the angle of the mouth

Question 16

Depressor Labii Inferioris

Answer 16

Origin: oblique line of the mandible, between the symphysis menti and the mental foramen
Insertion: Midline of the lower lip
Action: depress the lower lip

Question 17

Mentalis

Answer 17

Origin: incisive fossa of the mandible
Insertion: Fascia and skin of the chin
Action: Elevates the lower lip and everts and protracts the lower lip

Question 18

What muscle has four quadrants, upper and lower on right and left anchoring to the modiolus - essentially attaching to itself?

Answer 18

Orbicularis Oris

Question 19

What’s the action of the Orbicularis Oris?

Answer 19

Closes the mouth and protract the lips

Question 20

Buccinator

Answer 20

O: External surfaces of the alveolar process of the mandible and maxilla ( opposite the molars), and the ptyergomandibular raphe
I: Deep to Modiolus
A: compress the cheek against the teeth

Question 21

Platysma

Answer 21

O: Fascia covering superior part of pectoralis major and deltoid
I: Base of mandible, skin and fascia of lower parts of face
A: Assist to depress mandible, tightens fascia of the neck, draw down corner of the mouth