Cranial Nerve I Innervates the _______

Question

Cranial nerve I innervates the _______.
A) retina of the eye
B) olfactory epithelium
C) many organs, including lungs and stomach
D) teeth

Accepted Answer

Cranial nerve I, also known as the olfactory nerve, innervates the olfactory epithelium in the nasal cavity, which is responsible for the sense of smell. The other options are innervated by other cranial nerves - the retina of the eye is innervated by the optic nerve (cranial nerve II), many organs including lungs and stomach are innervated by the vagus nerve (cranial nerve X), and teeth are innervated by branches of the trigeminal nerve (cranial nerve V).