Table of contents

1. Introduction to Anatomy & Physiology5h 43m
2. Cell Chemistry & Cell Components12h 36m
3. Energy & Cell Processes10h 6m
4. Tissues & Histology10h 3m
5. Integumentary System2h 20m
6. Bones & Skeletal Tissue2h 16m
7. The Skeletal System2h 35m
8. Joints2h 17m
9. Muscle Tissue2h 33m
10. Muscles1h 11m
11. Nervous Tissue and Nervous System1h 35m
12. The Central Nervous System1h 6m
- Introduction to the Central Nervous System
  18m
- The Cerebrum
  48m
13. The Peripheral Nervous System1h 26m
14. The Autonomic Nervous System1h 38m
15. The Special Senses2h 41m
16. The Endocrine System2h 48m
17. The Blood3h 22m
18. The Heart3h 42m
19. The Blood Vessels3h 35m
20. The Lymphatic System3h 16m
21. The Immune System14h 37m
22. The Respiratory System3h 20m
23. The Digestive System2h 5m
24. Metabolism and Nutrition4h 0m
25. The Urinary System2h 39m
26. Fluid and Electrolyte Balance, Acid Base Balance37m
27. The Reproductive System2h 5m
28. Human Development1h 21m
29. Heredity3h 32m

13. The Peripheral Nervous System

Sensory Receptor Classification by Modality

Anatomy & Physiology

13. The Peripheral Nervous System

Sensory Receptor Classification by Modality

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Problem 7

Textbook Question

First-order 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

Verified step by step guidance

Step 1: Understand the structure of first-order somatic sensory neurons. These neurons are responsible for transmitting sensory information from the periphery (e.g., skin, muscles) to the central nervous system (CNS).

Step 2: Recall the classification of neurons based on their structure. Neurons can be multipolar, bipolar, or pseudounipolar. Pseudounipolar neurons are specialized for sensory functions and have a single process that splits into two branches: one extending to the periphery and the other to the CNS.

Step 3: Identify the location of the cell bodies of first-order somatic sensory neurons. These cell bodies are located in the posterior root ganglion (also called the dorsal root ganglion), which is part of the peripheral nervous system and lies just outside the spinal cord.

Step 4: Eliminate incorrect options based on the structural type and location. For example, multipolar neurons are typically motor neurons, and bipolar neurons are found in special sensory systems like the retina. The posterior horn is part of the spinal cord's gray matter and does not house sensory neuron cell bodies.

Step 5: Conclude that the correct answer is the option describing pseudounipolar neurons with cell bodies located in the posterior root ganglion, as this matches the anatomy and physiology of first-order somatic sensory neurons.

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Key Concepts

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

First-order somatic sensory neurons

First-order somatic sensory neurons are responsible for transmitting sensory information from the periphery to the central nervous system. They are the initial neurons in the sensory pathway, detecting stimuli such as touch, pain, and temperature. Understanding their role is crucial for grasping how sensory information is processed in the nervous system.

Pseudounipolar neurons

Pseudounipolar neurons are a type of neuron characterized by a single axon that splits into two branches, one extending to the periphery and the other to the central nervous system. This structure allows for efficient transmission of sensory information. They are commonly found in sensory ganglia, such as the posterior root ganglion, where they relay sensory signals.

Posterior root ganglion

The posterior root ganglion is a cluster of sensory neuron cell bodies located just outside the spinal cord. It serves as a relay point for sensory information entering the spinal cord from the body. Understanding its location and function is essential for identifying the pathways through which sensory information is processed and integrated.