A&P Chapter 21: Peripheral Nervous System

Question 1

1. Which of the following is an incorrect statement?
   a. There are 7 cervical nerve pairs.
   b. There are 12 thoracic nerve pairs.
   c. There are 5 lumbar nerve pairs.
   d. All of the above are correct statements.

Answer 1

1. a. There are 7 cervical nerve pairs.
   p. 480

Chapter 21: Peripheral Nervous System

Question 2

2. The spinal root that has a noticeable swelling is the:
   a. ventral root.
   b. anterior root.
   c. dorsal root.
   d. none of the above.

Answer 2

2. c. dorsal root.
   p. 481

Chapter 21: Peripheral Nervous System

Question 3

3. The dorsal root ganglion contains:
   a. sensory neuron cell bodies.
   b. motor neuron cell bodies.
   c. both sensory neuron and motor neuron cell bodies.
   d. motor neuron fibers.

Answer 3

3. a. sensory neuron cell bodies.
   pp. 481-482

Chapter 21: Peripheral Nervous System

Question 4

4. The phrenic nerve innervates the:
   a. spleen.
   b. diaphragm.
   c. chest muscles.
   d. none of the above.

Answer 4

4. b. diaphragm.
   p. 483

Chapter 21: Peripheral Nervous System

Question 5

5. The femoral nerve arises from the:
   a. lumbar plexus.
   b. sacral plexus.
   c. coccygeal plexus.
   d. brachial plexus.

Answer 5

5. a. lumbar plexus.
   p. 486

Chapter 21: Peripheral Nervous System

Question 6

6. ______ The lower end of the spinal cord is called the cauda equina.

True or False

Answer 6

6. True
   p. 481

Chapter 21: Peripheral Nervous System

Question 7

7. ______ There are 31 pairs of spinal nerves, all of which are composed of both motor and sensory fibers.

True or False

Answer 7

7. True
   p. 480

Chapter 21: Peripheral Nervous System

Question 8

8. ______ Herpes zoster is a unique bacterial infection that almost always affects the skin of a single dermatome.

True or False

Answer 8

8. False
   p. 488

Chapter 21: Peripheral Nervous System

Question 9

9. ______ Dermatome is a term referring to a skeletal muscle group innervated by motor neuron axons from a given spinal nerve.

True or False

Answer 9

9. False
   p. 489

Chapter 21: Peripheral Nervous System

Question 10

10. ______ The brachial plexus is found deep within the shoulder.

True or False

Answer 10

10. True
    p. 485

Chapter 21: Peripheral Nervous System

Question 11

23. Somatic effectors are:
    a. smooth muscle.
    b. skeletal muscle.
    c. cardiac muscle.
    d. glands.

Answer 11

23. b. skeletal muscle.
    p. 495

Chapter 21: Peripheral Nervous System

Question 12

24. When the outer sole of the foot is stimulated, a normal infant will extend the great toe. This is called the:
    a. Babinski reflex.
    b. plantar reflex.
    c. tendon reflex.
    d. corneal reflex.

Answer 12

24. a. Babinski reflex.
    p. 497

Chapter 21: Peripheral Nervous System

Question 13

25. Which is the neurotransmitter in a somatic motor pathway?
    a. acetylcholine
    b. amines
    c. amino acids
    d. neuropeptides

Answer 13

25. a. acetylcholine
    p. 495

Chapter 21: Peripheral Nervous System

Question 14

Applying What You Know!

26. Ethan had difficulty swallowing and he noticed his mouth was extremely dry. The doctor advised him that the problem may be related to a nerve.

Question a. What two nerves might possibly be causing the problem?

Question b. These nerves are mixed nerves. What is meant by that statement?

Answer 14

26. (a) The two nerves that might possibly be involved are cranial nerve IX (glossopharyngeal) and cranial nerve X (vagus).
    (b) Both nerves are mixed, meaning that they contain axons of sensory and motor neurons.

Chapter 21: Peripheral Nervous System

Question 15

Applying What You Know!

27. Mason is under great stress from trying to advance in his career, pursue graduate school, and raise two small children. After a particularly stressful event, he noticed a burning sensation in his axillary and pectoral regions. Days later he experienced an eruption of red swollen plaques in the same area.

Question a. What condition is he experiencing?

Question b. What is the name of the responsible pathogen?

Question c. Why did he experience the symptoms that he did?

Question d. What may be the reason that the pathogen was capable of breaching his immune system?

Answer 15

27. (a) Herpes zoster, or shingles.
    (b) Varicella zoster virus, or chickenpox.
    (c) It attacks a dermatome (T-4) and symptoms occur in that region.
    (d) His immunologic protective mechanism may have become diminished due to the stress.

Chapter 21: Peripheral Nervous System

Question 16

28. Which one of the following doesn’t have a sensory function?
    a. abducens
    b. trigeminal
    c. facial
    d. vagus

Answer 16

28. a. abducens
    p. 489

Chapter 21: Peripheral Nervous System

Question 17

29. Which nerve is a mixed nerve that arises from the medulla and is distributed to numerous organs?
    a. trochlear
    b. accessory
    c. hypoglossal
    d. vagus

Answer 17

29. d. vagus
    p. 494

Chapter 21: Peripheral Nervous System

Question 18

30. Parasympathetic innervation of the heart is assisted by the:
    a. vagus nerve.
    b. facial nerve.
    c. trigeminal nerve.
    d. glossopharyngeal nerve.

Answer 18

30. a. vagus nerve.
    p. 494

Chapter 21: Peripheral Nervous System

Question 19

31. Which nerve is involved in smiling and frowning?
    a. vagus
    b. trigeminal
    c. facial
    d. glossopharyngeal

Answer 19

31. c. facial
    p. 490

Chapter 21: Peripheral Nervous System

Question 20

38. ______ 12 pairs
    a. cranial nerves
    b. spinal nerves

Answer 20

38. a. cranial nerves
    p. 480

Chapter 21: Peripheral Nervous System

Question 21

39. ______ dermatome
    a. cranial nerves
    b. spinal nerves

Answer 21

39. b. spinal nerves
    p. 487

Chapter 21: Peripheral Nervous System

Question 22

40. ______ vagus
    a. cranial nerves
    b. spinal nerves

Answer 22

40. a. cranial nerves
    p. 494

Chapter 21: Peripheral Nervous System

Question 23

41. ______ shingles
    a. cranial nerves
    b. spinal nerves

Answer 23

41. b. spinal nerves
    p. 488

Chapter 21: Peripheral Nervous System

Question 24

42. ______ 31 pairs
    a. cranial nerves
    b. spinal nerves

Answer 24

42. b. spinal nerves
    p. 480

Chapter 21: Peripheral Nervous System

Question 25

43. ______ optic a. cranial nerves b. spinal nerves

Answer 25

43. a. cranial nerves p. 489 Chapter 21: Peripheral Nervous System

Question 26

44. ______ C1 a. cranial nerves b. spinal nerves

Answer 26

44. b. spinal nerves p. 480 Chapter 21: Peripheral Nervous System

Question 27

45. ______ plexus a. cranial nerves b. spinal nerves

Answer 27

45. b. spinal nerves p. 482 Chapter 21: Peripheral Nervous System

Question 28

46. ______ myotome a. cranial nerves b. spinal nerves

Answer 28

46. b. spinal nerves p. 489 Chapter 21: Peripheral Nervous System

Question 29

47. ______ accessory a. cranial nerves b. spinal nerves

Answer 29

47. a. cranial nerves p. 494 Chapter 21: Peripheral Nervous System

Question 30

11. ______ facial expressions a. olfactory b. optic c. oculomotor d. trochlear e. trigeminal f. abducens g. facial h. vestibulocochlear i. glossopharyngeal j. vagus k. accessory l. hypoglossal

Answer 30

11. g. facial p. 490 Chapter 21: Peripheral Nervous System

Question 31

12. ______ sense of smell a. olfactory b. optic c. oculomotor d. trochlear e. trigeminal f. abducens g. facial h. vestibulocochlear i. glossopharyngeal j. vagus k. accessory l. hypoglossal

Answer 31

12. a. olfactory p. 490 Chapter 21: Peripheral Nervous System

Question 32

13. ______ peristalsis a. olfactory b. optic c. oculomotor d. trochlear e. trigeminal f. abducens g. facial h. vestibulocochlear i. glossopharyngeal j. vagus k. accessory l. hypoglossal

Answer 32

13. j. vagus p. 493 Chapter 21: Peripheral Nervous System

Question 33

14. ______ hearing and balance a. olfactory b. optic c. oculomotor d. trochlear e. trigeminal f. abducens g. facial h. vestibulocochlear i. glossopharyngeal j. vagus k. accessory l. hypoglossal

Answer 33

14. h. vestibulocochlear p. 493 Chapter 21: Peripheral Nervous System

Question 34

15. ______ vision a. olfactory b. optic c. oculomotor d. trochlear e. trigeminal f. abducens g. facial h. vestibulocochlear i. glossopharyngeal j. vagus k. accessory l. hypoglossal

Answer 34

15. b. optic p. 490 Chapter 21: Peripheral Nervous System

Question 35

16. ______ chewing a. olfactory b. optic c. oculomotor d. trochlear e. trigeminal f. abducens g. facial h. vestibulocochlear i. glossopharyngeal j. vagus k. accessory l. hypoglossal

Answer 35

16. e. trigeminal p. 490 Chapter 21: Peripheral Nervous System

Question 36

17. ______ swallowing a. olfactory b. optic c. oculomotor d. trochlear e. trigeminal f. abducens g. facial h. vestibulocochlear i. glossopharyngeal j. vagus k. accessory l. hypoglossal

Answer 36

17. i. glossopharyngeal p. 493 Chapter 21: Peripheral Nervous System

Question 37

18. ______ regulation of pupil size a. olfactory b. optic c. oculomotor d. trochlear e. trigeminal f. abducens g. facial h. vestibulocochlear i. glossopharyngeal j. vagus k. accessory l. hypoglossal

Answer 37

18. c. oculomotor p. 490 Chapter 21: Peripheral Nervous System

Question 38

19. ______ innervation of the superior oblique muscle of the eye a. olfactory b. optic c. oculomotor d. trochlear e. trigeminal f. abducens g. facial h. vestibulocochlear i. glossopharyngeal j. vagus k. accessory l. hypoglossal

Answer 38

19. d. trochlear p. 490 Chapter 21: Peripheral Nervous System

Question 39

20. ______ abduction of the eye a. olfactory b. optic c. oculomotor d. trochlear e. trigeminal f. abducens g. facial h. vestibulocochlear i. glossopharyngeal j. vagus k. accessory l. hypoglossal

Answer 39

20. f. abducens p. 490 Chapter 21: Peripheral Nervous System

Question 40

21. ______ tongue movements a. olfactory b. optic c. oculomotor d. trochlear e. trigeminal f. abducens g. facial h. vestibulocochlear i. glossopharyngeal j. vagus k. accessory l. hypoglossal

Answer 40

21. l. hypoglossal p. 493 Chapter 21: Peripheral Nervous System

Question 41

22. ______ shoulder movements a. olfactory b. optic c. oculomotor d. trochlear e. trigeminal f. abducens g. facial h. vestibulocochlear i. glossopharyngeal j. vagus k. accessory l. hypoglossal

Answer 41

22. k. accessory p. 493 Chapter 21: Peripheral Nervous System