ANATOMY&PHYSIOLOGY CONNECT ONLY >I<
ANATOMY&PHYSIOLOGY CONNECT ONLY >I<
4th Edition
ISBN: 9781265708627
Author: McKinley
Publisher: MCG CUSTOM
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Chapter 13, Problem 1DYKB

_____ 1. Which cranial nerve is responsible for innervating the intrinsic and extrinsic tongue muscles?

  1. a. accessory (CN XI)
  2. b. glossopharyngeal (CN IX)
  3. c. trigeminal (CN V)
  4. d. hypoglossal (CN XII)
Expert Solution & Answer
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Summary Introduction

Introduction:

There are 12 pairs of cranial nerves which originate towards the inferior surface of the brain. The cranial nerves are a part of the peripheral nervous system. The naming of cranial nerves is based on the positions. The naming begins from the anteriorly placed nerves.

Answer to Problem 1DYKB

Correct answer:

The hypoglossal nerve innervates intrinsic tongue muscle as well as the extrinsic tongue muscles. Therefore, option d. is correct.

Explanation of Solution

Reason for the correct statement:

Option d. is given as “hypoglossal (CN XII)”. There are nine pairs of cranial nerves which have somatic functions with the autonomic or sensory roles. The CN XII has only somatic motor function. This nerve innervates the extrinsic and intrinsic tongue muscles. Hence, intrinsic and extrinsic tongue muscles are innervated by hypoglossal or CN XII.

Hence, option d. is correct.

Reasons for incorrect statements:

Option a. is given as “accessory (CN XI)”. CN XI innervates the sternocleidomastoid and trapezius muscles. Hence, option a. is incorrect.

Option b. is given as “glossopharyngeal (CN IX)”. CN IX receives touch and taste sensation from one-third of the tongue and also innervates the parotid salivary gland and pharynx muscles. Hence, option b. is incorrect.

Option c. is given as “trigeminal (CN V)”. CN V innervates the muscles of mastication and receives sensory signals from the anterior scalp, meninges, nasal cavity, oral cavity, and face. Hence, option c. is incorrect.

Hence, options a., b., and c. are incorrect.

Conclusion

The hypoglossal nerve innervates the extrinsic and intrinsic muscles of the tongue.

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Chapter 13 Solutions

ANATOMY&PHYSIOLOGY CONNECT ONLY >I<

Ch. 13.3 - Prob. 11WDYLCh. 13.3 - What is the function of the corpus callosum?Ch. 13.3 - Prob. 13WDYLCh. 13.3 - Prob. 14WDYLCh. 13.3 - Prob. 15WDYLCh. 13.3 - Prob. 16WDYLCh. 13.3 - Prob. 17WDYLCh. 13.3 - Prob. 18WDYLCh. 13.3 - Prob. 19WDYLCh. 13.3 - Prob. 20WDYLCh. 13.4 - Prob. 21WDYLCh. 13.4 - What is the general function of the thalamus?Ch. 13.4 - Prob. 23WDYLCh. 13.5 - What is the function of the substantia nigra, and...Ch. 13.5 - Prob. 25WDYLCh. 13.5 - Prob. 26WDYLCh. 13.5 - Prob. 27WDYLCh. 13.5 - What are the three main autonomic centers located...Ch. 13.6 - Prob. 29WDYLCh. 13.6 - Prob. 30WDYLCh. 13.6 - Prob. 31WDYLCh. 13.6 - Prob. 32WDYLCh. 13.7 - Prob. 33WDYLCh. 13.7 - How is the reticular activating system related to...Ch. 13.8 - Prob. 35WDYLCh. 13.8 - Prob. 36WDYLCh. 13.8 - What are the main differences between non-REM and...Ch. 13.8 - Prob. 38WDYLCh. 13.8 - Prob. 39WDYLCh. 13.8 - Prob. 40WDYLCh. 13.8 - How is the Wernicke area involved in language...Ch. 13.9 - Prob. 42WDYLCh. 13.9 - Prob. 43WDYLCh. 13 - _____ 1. Which cranial nerve is responsible for...Ch. 13 - Prob. 2DYKBCh. 13 - _____ 3. Which of these is the least likely to...Ch. 13 - Prob. 4DYKBCh. 13 - Prob. 5DYKBCh. 13 - Prob. 6DYKBCh. 13 - Prob. 7DYKBCh. 13 - Prob. 8DYKBCh. 13 - Prob. 9DYKBCh. 13 - Prob. 10DYKBCh. 13 - Prob. 11DYKBCh. 13 - Prob. 12DYKBCh. 13 - Prob. 13DYKBCh. 13 - Prob. 14DYKBCh. 13 - Prob. 15DYKBCh. 13 - Describe the pathway by which the pressure applied...Ch. 13 - Prob. 17DYKBCh. 13 - During surgery to remove a tumor from the...Ch. 13 - What is the difference between apraxia of speech...Ch. 13 - Prob. 20DYKBCh. 13 - Prob. 1CALCh. 13 - Prob. 2CALCh. 13 - Prob. 3CALCh. 13 - Why did Shannon experience the problems with her...Ch. 13 - Prob. 5CALCh. 13 - Peyton felt strange when she awoke one morning....Ch. 13 - Prob. 2CSLCh. 13 - During a robbery at his convenience store, Dustin...
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