How many pairs of cranial nerves originate in the brain?

Appeared in: Tripura CHO - 2021

Explanation

The human body has 12 pairs of cranial nerves that originate from the brain and brainstem.
These nerves are responsible for a wide range of sensory, motor, and autonomic functions related to the head, neck, and several internal organs.
Cranial nerves I (Olfactory) and II (Optic) originate from the cerebrum, while nerves III through XII originate from the brainstem (midbrain, pons, and medulla oblongata).
This number is a standard anatomical fact crucial for neurological assessments.

Option B: This is the number of cervical spinal nerves, not cranial nerves. Spinal nerves emerge from the spinal cord, whereas cranial nerves emerge from the brain.
Option C: This is an incorrect count. The number 14 does not correspond to any standard grouping of nerve pairs in human neuroanatomy.
Option D: This is an incorrect count for cranial nerves in humans. The number 16 is not anatomically correct.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Anatomy of the Central Nervous System: Cranial Nerves as background academic context rather than a clinical decision trigger.
A thorough assessment of all 12 cranial nerves is a cornerstone of the neurological examination. It helps nurses and doctors localize lesions (e.g., from a stroke, tumor, or head injury) within the brain and brainstem.
Changes in cranial nerve function, such as a newly dilated pupil (CN III) or facial droop (CN VII), can be critical early signs of increasing intracranial pressure (ICP) or brain herniation, requiring immediate intervention.
What if? If a patient suddenly develops difficulty swallowing (dysphagia) and a hoarse voice, the nurse should suspect dysfunction of the Glossopharyngeal (CN IX) and Vagus (CN X) nerves, which could indicate a brainstem stroke or lesion, and immediately initiate aspiration precautions and notify the physician.

How to Approach the Question

First, identify the core of the question. It's asking for a specific, factual number related to human anatomy: the quantity of cranial nerve pairs.
This is a direct recall question. Access your foundational knowledge of the central nervous system.
Recall the standard number of cranial nerves. The universally accepted count in humans is 12 pairs.
Scan the options provided and select the one that matches this known anatomical fact.
Mentally dismiss the other options. For example, recognize that '8' relates to cervical spinal nerves, not cranial nerves, which is a common point of confusion.

Concept Tested & Keywords

QlGi68x5RuMhohKxTJKqJH

E6 Anatomy Grays 43e Vol 1 Part 3 p. 33-35

E6 Nursing Brunner Adult Health 3SA Vol 2 Part 2 p. 1-3

E6 Anatomy Applied Ashalatha 4e p. 424-426

Practise the full Tripura CHO - 2021

Attempt every question from this paper in a timed mock, then review the full solution for each one.