What cranial nerve is responsible for the taste sensation of the posterior third of the tongue?

Facial

Abducens

Glossopharyngeal

Hypoglossal

Answer and Explanation

The Correct Answer is C

Choice A Reason:
The facial nerve, or cranial nerve VII, is responsible for the taste sensation in the anterior two-thirds of the tongue, not the posterior third. It carries taste sensations from the front part of the tongue via the chorda tympani branch.

Choice B Reason:
The abducens nerve, or cranial nerve VI, has no role in taste sensation. It is primarily involved in controlling the lateral rectus muscle of the eye, which abducts the eye.

Choice C Reason:
The glossopharyngeal nerve, or cranial nerve IX, provides special sensory innervation for taste to the posterior third of the tongue. This enables the sensation of various tastes like salty, sweet, sour, and bitter in this region.

Choice D Reason:
The hypoglossal nerve, or cranial nerve XII, is responsible for motor control of the tongue muscles but does not provide sensory innervation for taste.

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Correct Answer is B

Explanation

Choice A Reason:
An ophthalmoscope is primarily used for examining the interior structures of the eye, such as the retina, and is not typically used for assessing near vision. It provides a view of the fundus of the eye, which is essential for diagnosing various eye conditions but does not directly assess a patient's reading or close-up vision.

Choice B Reason:
The Snellen Chart is traditionally used to measure distance visual acuity and would not be the first choice for assessing near vision. However, there are versions of the Snellen Chart or similar charts designed for near vision assessment, typically held at a reading distance of about 14 inches from the patient. These charts have rows of letters or symbols that decrease in size and are used to determine the smallest print size a person can read.

Choice C Reason:
A magazine can be a practical tool for assessing near vision informally, as it contains various sizes of print and is a good representation of everyday reading material. The nurse can ask the patient to read a specific paragraph to observe their ability to see and comprehend text at a close distance.

Choice D Reason:
A penlight is not used for assessing near vision. It is typically used to assess the pupillary light reflex or to illuminate specific areas of the eye during an examination. The penlight helps to evaluate the response of the pupils to light but does not measure the patient's ability to read or see objects up close.

A. Down B. To the left C. To the right D. Up

Correct Answer is D

Explanation

Choice A Reason:
Looking down does not typically expose the sclera and conjunctiva for examination. The lower eyelid covers more of the sclera when the eyes are directed downward, making it less accessible for observation.

Choice B Reason:
Moving the eyes to the left is not the standard direction for examining the sclera and conjunctiva. This movement would not provide an optimal view of the entire sclera and conjunctiva, as it would only stretch the lateral part of the conjunctiva.

Choice C Reason:
Directing the eyes to the right, similar to moving them to the left, does not offer the best exposure for examining the sclera and conjunctiva. The medial part of the conjunctiva would be stretched, but the rest would not be easily visible.

Choice D Reason:
Instructing the client to look up is the correct procedure when examining the sclera and conjunctiva. By looking upward, the client exposes more of the sclera and the palpebral conjunctiva, allowing the nurse to inspect these areas thoroughly for any abnormalities such as redness, swelling, or foreign bodies.

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What cranial nerve is responsible for the taste sensation of the posterior third of the tongue?

Nursing Test Bank

Naxlex Comprehensive Predictor Exams

The nurse working in an ophthalmology clinic is preparing to assess a patient's near vision. Which piece of equipment would the nurse use for this assessment?

Correct Answer is B

Explanation

When preparing to examine a client's sclera and conjunctiva during an eye examination, the nurse should instruct the client to move both eyes to look in which direction?

Correct Answer is D

Explanation

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