All the cranial nerves are both sensory and motor EXCEPT:

The statement is not entirely correct. Not all cranial nerves have both sensory and motor functions. Some cranial nerves have only sensory functions, some have only motor functions, and some have both.

The cranial nerves that have only sensory functions are:

1. Olfactory nerve (Cranial nerve I) - responsible for smell.
2. Optic nerve (Cranial nerve II) - responsible for vision.
3. Vestibulocochlear nerve (Cranial nerve VIII) - responsible for hearing and balance.

The cranial nerves that have only motor functions are:

1. Trochlear nerve (Cranial nerve IV) - controls the superior oblique eye muscle.
2. Abducens nerve (Cranial nerve VI) - controls the lateral rectus eye muscle.
3. Accessory nerve (Cranial nerve XI) - controls the sternocleidomastoid and trapezius muscles.
4. Hypoglossal nerve (Cranial nerve XII) - controls the muscles of the tongue.

The rest of the cranial nerves have both sensory and motor functions.