Which cranial nerve is responsible for sensations from the face, jaw movement, and motor functions?

The trigeminal nerve is the correct answer because it is primarily responsible for sensation in the face and motor functions such as jaw movement. It is the fifth cranial nerve and has three major branches (ophthalmic, maxillary, and mandibular) that provide sensory innervation to different regions of the face.

In addition to its sensory function, the trigeminal nerve supplies motor fibers to the muscles involved in mastication, which are necessary for chewing. This dual functionality of providing both sensation and motor control makes the trigeminal nerve integral to facial sensation and movement.

The other cranial nerves mentioned do not fulfill the same combined roles; for example, the facial nerve is primarily responsible for facial expressions and taste sensations but does not have significant roles in sensory data from the face or jaw movement like the trigeminal nerve does. The vagus nerve is involved in autonomic functions, and the accessory nerve serves primarily motor functions to the sternocleidomastoid and trapezius muscles. Thus, the specificity of the trigeminal nerve in providing facial sensations and controlling jaw muscles distinguishes it as the correct answer.