Muscles of Facial Expression

Question 1

What are the 5 facial muscles used in facial expression?

Answer 1

Occipitofrontalis - forehead
Orbicularis Oculi - around eye socket
Buccinator - cheek muscles
Orbicularis Oris - around the mouth 
Platysma - along the chin and neck 

they are all innervated by the facial nerve CN V11 or CN 7

Question 2

Occipitofrontalis (Forehead muscle)

PA
DA
N/S
A

Answer 2

Has two bellies - Frontal and Occipital
Joined by the epicranial aponeurosis.

Frontal belly - epicranial aponeurosis
Occipital belly - Lateral 2/3 of superior nuchal line

Frontal belly - skin and subcutaneous tissue of eyebrows and forehead
Occipital belly - epicranial aponeurosis

Elevates the eyebrows, wrinkles skin on the forehead, retracts scalp

Question 3

Orbicular Oculi (around eyes)

PA
DA
N/S
A

Answer 3

Has two parts - Palpebral part (eyelids) - the inner part
- Orbital part - the outer part

Medial orbital margin, medial palpebral ligament, lacrimal bone.

Skin around the margin of the orbit, superior and inferior tarsal plates in eyelids

Palpebral - Closes eyelids gently
Orbital - Closes eyelids tightly - Winking

Question 4

Buccinator (cheek)

PA
DA
N/S
A

Answer 4

Alvealor processes of maxilla and mandible

Angle of the mouth and orbicular Oris

Presses cheek against molar teeth, resists distension of the cheek when blowing

Question 5

Orbicularis Oris (around the mouth) ( Kissing muscle)

PA
DA
N/S
A

Answer 5

Maxilla and mandible bones and angle of the mouth

Mucous membranes of lips

Holds lips closed, compresses and protrudes lips

Question 6

Platysma

PA
DA
N/S
A

Answer 6

Contained within the subcutaneous tissue of the neck

The subcutaneous fascia of the supra and infraclavicular regions

Mandible, skin of cheek and lower lip

Depresses mandible, tenses skin of the inferior face and neck