Cranial Nerves and Facial Muscles

This tutorial covers the muscles responsible for facial expressions, focusing on the muscles innervated by the seventh cranial nerve. It explains the testing of these muscles and provides a detailed examination of the orbital, nasal, and oral muscle groups, including their structure and function.

Which cranial nerve is responsible for innervating the muscles of facial expression?

• Fifth cranial nerve

• Tenth cranial nerve

• Seventh cranial nerve

• Ninth cranial nerve

What is the function of the occipitofrontalis muscle?

• To wrinkle the forehead

• To compress the lips

• To close the eyelids

• To flare the nostrils

What is the role of the orbicularis oculi muscle?

• To raise the eyebrows

• To close the eyelids

• To depress the nasal septum

• To open the mouth

Which part of the orbicularis oculi is responsible for gently closing the eyelids?

• Orbital part

• Palpebral part

• Transverse part

• AAR part

Which muscle is involved in drawing the eyebrows medially and downward?

• Procerus

• Corrugator supercilii

• Nasalis

• Depressor septi

What is the function of the procerus muscle?

• To depress the nasal septum

• To cause frowning

• To flare the nostrils

• To compress the nostrils

Which part of the nasalis muscle is responsible for flaring the nostrils?

• Palpebral part

• Orbital part

• AAR part

• Transverse part

What is the primary function of the orbicularis oris muscle?

• To open the mouth

• To close the eyelids

• To raise the eyebrows

• To narrow the mouth and close the lips

Which muscle group includes the orbicularis oris?

• Oral muscle group

• Orbital muscle group

• Superior muscle group

• Nasal muscle group

What is the Latin term for 'mouth' that helps remember the orbicularis oris?

• Frontalis

• Oculus

• Nasalis

• Os oris