HEAD MUSCLES: FACE

Question 1

Which nerves innervate the occipitofrontalis?

Answer 1

Frontal belly of Occipitofrontalis:
Temporal branch of facial nerve (CN VII)

Occipital belly of Occipitofrontalis:
Posterior auricular nerve, extracranial branch of the facial nerve (CN VII)

Question 2

Which blood vessels supply the occipitofrontalis?

Answer 2

Supraorbital and Supratrochlear arteries
(branches of the Ophthalmic artery which is the first branch of the internal carotid artery distal to the cavernous sinus)

Question 3

Where is the origin of the occipitofrontalis?

Answer 3

Front belly of Occipitofrontalis:
Epicranial aponeurosis
(Galea aponeurotica, Aponeurosis epicranialis, Aponeurosis epicrania)

Occipital belly of Occipitofrontalis:
Lateral two thirds of superior nuchal line

Question 4

Where is the insertion of the occipitofrontalis?

Answer 4

Front belly of Occipitofrontalis:
Skin and subcutaneous tissue of eyebrows and forehead

Occipital belly of Occipitofrontalis:
Epicranial aponeurosis

Question 5

Function of Occipitofrontalis

Answer 5

Front belly of Occipitofrontalis:
Elevates eyebrows and wrinkles skin of forehead; protracts scalp (indicating surprise or curiosity)

Occipital belly of Occipitofrontalis:
Retracts scalp; increasing effectiveness of frontal belly