Cranial Nerve Supply to External Ear

Several cranial nerves provide sensory and/or motor innervation to the external ear. Understanding their specific roles helps identify the one that does not.

• Cranial Nerve V (Trigeminal Nerve): Provides general sensory innervation to the anterior and superior aspects of the external ear.
• Cranial Nerve VII (Facial Nerve): Supplies sensory innervation to a small area of the external ear canal (concha) and motor control to muscles around the ear.
• Cranial Nerve IX (Glossopharyngeal Nerve): Provides general sensory innervation to the inferior aspect of the external ear, including the lobule and posterior part of the concha.

Cranial Nerve NOT Supplying External Ear

Cranial Nerve VI (Abducens Nerve): This nerve's primary function is motor control of the eye, specifically the lateral rectus muscle, which directs the eye outward. It does not have any known distribution or supply to the structures of the external ear.

Therefore, Cranial Nerve VI is the correct answer as it does not innervate the external ear.