Which of the cranial nerves below make up of sensory and motor neurons?

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Question restatement: Which of the cranial nerves below make up of sensory and motor neurons?

Option a: Intermediate Nerve. This nerve is not a standard name in the classic cranial nerve taxonomy, and there is no widely recognized cranial nerve primarily referred to as the 'Intermediate Nerve' that is known to be mixed with sensory and motor fibers. Therefore, this option does not provide a valid or testable mixed-sensory-motor cranial nerve.

Option b: Olfactory Nerve. The olfactory nerve (Cranial Nerve I) is primarily sensory, responsible for smell. It does not have a motor component, so it is not mixed. This makes it an incorrect choice for a nerve containing both sensory and motor neurons.

Option c: Facial Motor Nerve. The term 'Facial Motor Nerve' would imply the motor component of the facial nerve, which is Cranial Nerve VII. While the facial nerve does carry motor fibers to facial muscles, it is not exclusively motor; it also carries sensory (taste) fibers from the anterior two-thirds of the tongue and parasympathetic fibers. However, if we take a strict label 'Facial Motor Nerve' as only motor, it would misrepresent the nerve’s mixed nature. In exam wording, the emphasis is on the nerve being mixed; the label here could be misleading and may be considered incorrect as stated.

Option d: Trigeminal Nerve. The trigeminal nerve (Cranial Nerve V) is classically described as a mixed nerve with both sensory and motor components: sensory information from the face and head, and motor fibers to the muscles of mastication. This aligns with the concept of neurons being both sensory and motor within the same nerve, fulfilling the criterion of a mixed (sensory and motor) cranial nerve.

Putting the pieces together, the option that clearly corresponds to a cranial nerve containing both sensory and motor neurons is the Trigeminal Nerve, while the others either lack a motor component, are not standardly named, or are misleading in their labeling. This aligns with the provided correct answer: Trigeminal Nerve.

ANT1800 - MUM S2 2025 Week 9 Kickoff Activity: Skull and the Brain

Which of the cranial nerves below make up of sensory and motor neurons?

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