Ch. 13 The Peripheral Nervous System

Amerman3rd EditionHuman Anatomy & PhysiologyISBN: 9780138247201, 9780138247928, 9780138201814Not the one you use?Change textbook

Amerman 3rd Edition

Ch. 13 The Peripheral Nervous System

Problem 11

Chapter 13, Problem 11

Place the following sequence of events for the detection of somatic sensation in the proper order. Place a 1 by the first event, a 2 by the second event, and so on.
a. The central process transmits the action potential to a second-order sensory neuron in the CNS.
b. The action potential is transferred to the central process in the posterior root ganglion.
c. The stimulus triggers an action potential.
d. The signal is transferred to other CNS sensory neurons for eventual perception and interpretation.
e. __The action potential is propagated along the peripheral process of the neuron.

Verified step by step guidance

Step 1: Begin by identifying the initial event in the sequence. The detection of somatic sensation starts when a stimulus triggers an action potential in the sensory receptor. This corresponds to option 'c'.

Step 2: Once the action potential is generated, it is propagated along the peripheral process of the sensory neuron. This corresponds to option 'e'.

Step 3: The action potential then reaches the posterior root ganglion, where it is transferred to the central process of the sensory neuron. This corresponds to option 'b'.

Step 4: The central process transmits the action potential to a second-order sensory neuron located in the central nervous system (CNS). This corresponds to option 'a'.

Step 5: Finally, the signal is transferred to other CNS sensory neurons for further processing, perception, and interpretation. This corresponds to option 'd'.

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Somatic Sensation

Somatic sensation refers to the body's ability to perceive stimuli from the environment through sensory receptors. This includes sensations such as touch, temperature, pain, and proprioception. Understanding somatic sensation is crucial for grasping how the body interacts with its surroundings and how these signals are processed by the nervous system.

Action Potential

An action potential is a rapid electrical signal that travels along the axon of a neuron, triggered by a stimulus. It is essential for the transmission of sensory information from peripheral receptors to the central nervous system (CNS). The generation and propagation of action potentials are fundamental processes in neural communication, allowing for the relay of sensory information.

Central Nervous System (CNS)

The central nervous system consists of the brain and spinal cord, serving as the main control center for processing sensory information. It interprets signals received from sensory neurons and coordinates responses. Understanding the role of the CNS is vital for comprehending how sensory information is integrated and perceived, leading to appropriate reactions to stimuli.

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Related Practice

Textbook Question

Why is visceral pain often perceived as cutaneous pain?

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Textbook Question

Mark the following statements about the spinal cord as true or false. If a statement is false, correct it to make a true statement.

The corticospinal tracts are the main sensory tracts in the spinal cord.

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Textbook Question

How do upper and lower motor neurons differ?

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Textbook Question

The tracts of the posterior columns decussate in the ________, whereas the tracts of the anterolateral system decussate in the ________.

Textbook Question

Tactile nerve endings, tactile corpuscles, bulbous corpuscles, and lamellated corpuscles are all types of:

a. Nociceptors

b. Mechanoreceptors

c. Photoreceptors

d. Chemoreceptors

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Textbook Question

Match the following nerves with the structures they innervate.

____Phrenic nerve

____Median nerve

____Femoral nerve

____Tibial nerve

____Radial nerve

____Intercostal nerves

____Common fibular nerve

____Musculocutaneous nerve

a. Motor to the triceps brachii muscle and muscles in the forearm that extend the hand; sensory from the posterior hand

b. Motor to the muscles in the anterior arm that flex the forearm; sensory from skin over the lateral forearm

c. Motor to the muscles in the anterior and lateral leg that evert and dorsiflex the foot; sensory from the skin of the anteroinferior leg

d. Motor to the diaphragm muscle

e. Motor to the muscles in the anterior thigh extend the knee; sensory from the skin over the anterior thigh and leg

f. Motor to the hamstring muscles that extend the thigh and flex the leg, muscles of the leg that plantarflex the foot, and muscles of the foot; sensory from the skin over the posterior and lateral leg and foot

g. Motor to the muscles between the ribs and the abdominal muscles; sensory from the skin over the abdomen

h. Motor to the muscles in the forearm that flex the hand, certain intrinsic hand muscles; sensory from the skin of the anterior hand

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