Muscles of the Face

Question 1

Orbicularis Oculi

Answer 1

Origin:

• medial palpebral ligament
• medial orbital margin

Insertion:

• lateral palpebral raphe
• skin around the margin of orbit

Action: closes eyelids

(orbital portion: closes eyelids forcefully
palpebral portion: closes eyelids slowly)

Question 2

Orbicularis Oris

Answer 2

Origin:

• from bone near the median plane of maxilla and mandible
• from the deep surface of the skin

Insertion: mucous membranes of lips

Action: compresses and protrudes lips

Question 3

Buccinator

Answer 3

It is a muscle of the cheek (L. trumpeter)

Origin:

• posteriorly from pterygomandibular raphe
• superiorly and inferiorly from alveolar processes of mandible and maxilla.

Insertion:
-angle of mouth

Action: presses cheek against molar teeth

• aids chewing
• compresses distended cheeks- air expulsion from oral cavity.

Question 4

Frontalis

Answer 4

Origin:
-epicranial aponeurosis

Insertion:
-skin of eyebrows

Action:

• elevates eyebrows
• wrinkles forehead

Question 5

Platysma

Answer 5

Superficial muscle of the neck and chin

Origin:
-superficial fascia of deltoid and pectoral regions

Insertion:

• body of mandible
• skin of cheek
• orbicularis oris

Action:

• Depresses the mandible
• tenses skin of lower face and neck

Question 6

Facial nerve (beyond stylomastoid foramen)
-and name of branches?

Answer 6

After emerging from the stylomastoid foramen, it immediately enters parotid gland
-it runs superficially in gland and gives rise to five terminal branches:

• Temporal
• Zygomatic
• Buccal
• Mandibular
• Cervical

These emerge from superior, anterior and inferior margins of parotid gland

Supplies muscles of facial expression.