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Human anatomy & physiology

Erin C. Amerman

Chapter 13

The Peripheral Nervous System - all with Video Answers

Educators

Chapter Questions

Problem 1

Mark the following statements as true or false. If a statement is false, correct it to make a true statement
a. The somatic sensory division of the PNS detects sensory information from the organs in the thoracic and abdominopelvic cavities.
b. The somatic motor division of the PNS consists of lower motor neurons that directly innervate skeletal muscle fibers.
c. The visceral motor division is also known as the autonomic nervous system and maintains many aspects of the body's homeostasis.
d. The term nerve is the equivalent of the term neuron.
e. There are 31 pairs of spinal nerves and 12 pairs of cranial nerves.

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00:50

Problem 2

Fill in the blanks: A spinal nerve divides into a(n) ___________ that serves the anterior side of the body and the limbs and a(n) ___________ that serves the posterior side of the body.

Sam Limsuwannarot
Sam Limsuwannarot
Numerade Educator

Problem 3

Fill in the blanks: The head and neck are innervated by ___________ pairs of ___________ nerves. Other body regions are innervated by ___________ pairs of ___________ nerves.

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16:00

Problem 4

First, write the Roman numeral that corresponds to each named cranial nerve (after the abbreviation CN). Second, match the cranial nerve with its correct function from the column on the right.
TABLE CAN'T COPY.

Eric Goldman
Eric Goldman
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01:06

Problem 5

Which cranial nerves are sensory only, primarily motor, and mixed?

Sanchit Jain
Sanchit Jain
Numerade Educator
01:15

Problem 6

Match the following nerves with the structures they innervate.
$$
\begin{array}{ll}
\begin{array}{l}
\text { Phrenic nerve } \\
\text { Median nerve }
\end{array} & \text { a. Motor to the triceps brachii } \\
\text { Femoral nerve } & \text { muscle and extensors of the } \\
\text { Tibial nerve } & \text { forearm; sensory from the } \\
\text { Radial nerve } & \text { b. Motor to the anterior arm } \\
\text { Intercostal nerves } & \text { muscles; sensory from skin } \\
\text { Common fibular } & \text { over the lateral forearm } \\
\text { nerve } & \text { c. Motor to the lateral and anterior } \\
\text { Musculocutaneous } & \text { leg muscles; sensory from the } \\
\text { nerve } & \text { skin of the anteroinferior leg } \\
& \text { d. Motor to the diaphragm } \\
& \text { e. Motor to the anterior thigh } \\
& \text { muscles; sensory from the skin } \\
& \text { over the anterior thigh and leg } \\
\text { f. Motor to the hamstring mus- } \\
\text { cles, flexor muscles of the leg, } \\
\text { muscles of the foot; sensory } \\
\text { from the skin over the poste- } \\
\text { rior and lateral leg and foot }
\end{array}
$$
g. Motor to the muscles between the ribs and the abdominal muscles; sensory from the skin over the abdomen
h. Motor to the flexors in the forearm, certain intrinsic hand muscles; sensory from the skin of the anterior hand

Sam Limsuwannarot
Sam Limsuwannarot
Numerade Educator
00:53

Problem 7

Somatic sensory neurons are_________ neurons whose cell bodies are located in the_________.
a. multipolar, posterior horn
b. pseudounipolar, posterior root ganglion
c. bipolar, anterior horn
d. pseudounipolar, posterior horn

Sam Limsuwannarot
Sam Limsuwannarot
Numerade Educator
00:39

Problem 8

The stretch of a full urinary bladder is detected by a(n):
a. photoreceptor.
b. exteroceptor.
c. thermoreceptor.
d. interoceptor.

Emily Terlap
Emily Terlap
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05:01

Problem 9

What is the sensory receptor in the knee-jerk reflex?

Rikhil Makwana
Rikhil Makwana
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00:31

Problem 10

Mechanoreceptors might detect which of the following sensations?
a. temperature
b. smell
c. light
d. pressure

Joanna Quigley
Joanna Quigley
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00:55

Problem 11

Place the following steps in order for motor control.
1. Upper motor neurons stimulate lower motor neurons.
2. Sensory information is relayed back to the cerebellum so movement can be modified if needed.
3. Upper motor neurons in the premotor cortex select a motor program.
4. Lower motor neurons stimulate a skeletal muscle to contract.
5. The basal nuclei enable the thalamus to stimulate upper motor neurons of the primary cortex.
a. $5,3,1,4,2$
b. $3,5,1,4,2$
c. $3,5,1,2,4$
d. $2,5,3,1,4$

Rikhil Makwana
Rikhil Makwana
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00:14

Problem 12

What is the least number of neurons required for a monosynaptic reflex to occur?

Sam Limsuwannarot
Sam Limsuwannarot
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01:18

Problem 13

List and describe the basic steps involved in producing movement, beginning with the upper motor neurons in the cerebral cortex.

Jessica Wooten
Jessica Wooten
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02:12

Problem 14

What type of motor neuron stimulates skeletal muscle fibers to contract by the excitation-contraction mechanism?
a. interneuron
b. $\alpha$-motor neuron
c. $\gamma$-motor neuron
d. upper motor neuron

Christina Sorrentino
Christina Sorrentino
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Problem 15

Fill in the blanks: Injury to a spinal nerve can lead to a________ motor neuron disorder, causing________ muscle tone, muscle weakness, or an inability to move the muscle.

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00:49

Problem 16

Which of the following is the correct order of events of a reflex arc?
a. Stimulus detection and delivery $\rightarrow$ motor response $\rightarrow$ integration in the CNS
b. Motor response $\rightarrow$ stimulus detection and delivery $\rightarrow$ integration in the CNS
c. Stimulus detection and delivery $\rightarrow$ integration in the CNS $\rightarrow$ delivery of motor response
d. Integration in the CNS $\rightarrow$ motor response $\rightarrow$ stimulus detection and delivery

Sam Limsuwannarot
Sam Limsuwannarot
Numerade Educator

Problem 17

Mark the following statements as true or false. If a statement is false, correct it to make a true statement.
a. The simple stretch reflex is a monosynaptic reflex with only a single synapse in the spinal cord between the sensory and motor neurons.
b. The Golgi tendon organs detect stretch in a simple stretch reflex.
c. A flexion reflex is a monosynaptic reflex with only one synapse in the spinal cord.
d. The crossed-extension reflex occurs simultaneously with the simple stretch reflex.

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01:06

Problem 18

Which two cranial nerves mediate the gag reflex?

Sanchit Jain
Sanchit Jain
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