Exam 30: Muscles of Facial Expression

The levator palpebrae superioris muscle is considered a muscle of the orbit because it is supplied by both the oculomotor and facial nerves.

Which does NOT have a role in frowning (Select all that apply. )?

The dilator naris raises the nostrils.This muscle causes the nostrils to flare or dilate.

Muscle that arises from the superior nuchal line of the occipital bone and the mastoid area is the

The mentalis muscle fibers originate in the mental foramen.These fibers terminate by inserting into the skin of the chin.

Muscles of the scalp move the scalp in a forward but not a backward movement.

The orbicularis oris is probably the most important muscle of the mouth because in addition to its role in forming facial expressions,this muscle is also referred to as an accessory muscle of mastication.

Muscles grouped around the mouth do not influence tooth alignment because abnormal pressures from one muscle group are balanced by muscles of other groups.

Both the corrugator and the platysma pull the eyebrow up.The corrugator muscle has fibers that extend to the lateral part of the eyebrow,whereas the procerus has fibers that extend to the medial end of the eyebrow.

Which muscle plays a role in mastication?

Which of the following can be influenced by abnormal pressure from muscles that surround the mouth (Select all that apply. )?

All of muscles surrounding the oral cavity interlace with the orbicularis oris.

Fibers of the mentalis muscle cross the midline.

The epicranius muscle is known by what other name?

The levator palpebrae superioris is not considered a facial nerve because it is not innervated by the facial nerve.

Which of the following are true of the buccinator muscle (Select all that apply. )?

The upper end of fibers of the platysma attach to the inferior border of the mandible.The platysma moves the skin over the neck,but it doesn't change the facial expression.

Which muscle originates from the lower rim of the orbit?

The action of the orbicularis oris is to close and compress the lips.

The facial nerve innervates muscles of facial expression and mastication.The facial nerve is the fifth cranial nerve.