1.) Mixed cranial nerves containing both motor and sensory fibers include all of the following except...

1.) Mixed cranial nerves containing both motor and sensory fibers include all of the following except the ____.

A. trigeminal

B. facial

C. vagus

D. optic

Expert Solution

The optic nerve is the sensory nerve. It is not a mixed nerve. It is the second cranial nerve .It is the nerve of sight . The correct answer is optic nerve.
Trigeminal nerve is the fifth cranial nerve which is mixed nerve. It has three divisions ophthalmic , maxillary and mandibular division.
The ophthalmic division is pure sensory division. The branches of this nerve is frontal, nasociliary and lacrimal.
The maxillary nerve provides sensory innervation to the midface region.It provides sensation to the palate , maxillary teeth & paranasal sinuses.
The mandibular division innervates the mandibular teeth and muscles of mastication .Also innervates the anterior belly of the digastric muscle, mylohyoid muscle, tensor tympani and tensor veli palatini.
Facial nerve is the seventh cranial nerve. It is the mixed nerve .It provides motor innervation to the muscles of facial expressions and sensation of taste to the anterior 2/3rd of tongue ,hard and soft palate.
The vagus nerve is tenth cranial nerve.It innervates the muscles of larynx and pharynx .It supplies the viscera of the neck ,thorax and abdomen.
It provides taste sensation from the posterior 1/3rd region of tongue.
Hence, all the three nerves are mixed only optic nerve is sensory nerve.

Sydney Mullin answered 1 year ago

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