Match the names of the cranial nerves in column B to the appropriate description in column A. Column A  _______    (1) causes pupillary constriction  _______    (2) the major sensory nerve of the face _______     (3) serves the sternocleido-mastoid and trapezius muscles  _______    (4) purely sensory (two nerves)  _______    (5) serves the tongue muscles  _______    (6) allows you to chew your food  _______    (7) impaired in Bell's palsy _______     (8) helps regulate heart activity _______     (9) helps you hear and maintain your balance  _______   (10) contain parasympathetic motor fibers (four nerves) Column B a. abducens b. accessory c. facial d. glossopharyngeal e. hypoglossal f. oculomotor g. olfactory h. optic i. trigeminal j. trochlear k. vagus l. vestibulocochlear

Verified step by step guidance

1. Identify the cranial nerve responsible for pupillary constriction, which is the oculomotor nerve (f).
2. Determine the major sensory nerve of the face, which is the trigeminal nerve (i).
3. Find the nerve that serves the sternocleidomastoid and trapezius muscles, which is the accessory nerve (b).
4. Identify the purely sensory nerves, which are the olfactory (g) and optic (h) nerves.
5. Determine the nerve that serves the tongue muscles, which is the hypoglossal nerve (e).

Key Concepts

Cranial Nerves Overview

Cranial nerves are a set of twelve paired nerves that emerge directly from the brain, primarily responsible for motor and sensory functions of the head and neck. Each nerve has specific roles, such as controlling facial muscles, transmitting sensory information, or regulating autonomic functions. Understanding their names and functions is crucial for identifying their roles in various physiological processes.

Sensory vs. Motor Functions

Cranial nerves can be classified based on their functions as sensory, motor, or mixed. Sensory nerves carry information from sensory receptors to the brain, while motor nerves transmit signals from the brain to muscles. Some cranial nerves, like the facial nerve, have both sensory and motor functions, making it essential to distinguish between these roles when matching them to descriptions.

Parasympathetic and Sympathetic Functions

Certain cranial nerves contain parasympathetic fibers, which are part of the autonomic nervous system responsible for rest-and-digest activities. These fibers help regulate involuntary functions such as heart rate and digestion. Recognizing which cranial nerves have parasympathetic roles is important for understanding their impact on bodily functions and matching them to the appropriate descriptions.