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

Introduction to the Peripheral Nervous System

Anatomy & Physiology

13. The Peripheral Nervous System

Introduction to the Peripheral Nervous System

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Multiple Choice

In motor pathways, the only portion of the pathway that is outside of the central nervous system (CNS) is the:

axon of the lower motor neuron

axon of the upper motor neuron

cell body of the upper motor neuron

dendrites of the upper motor neuron

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Verified step by step guidance

Understand the structure of motor pathways: Motor pathways consist of upper motor neurons and lower motor neurons. Upper motor neurons originate in the brain and communicate with lower motor neurons, which directly innervate muscles.

Identify the location of upper motor neurons: The cell body and dendrites of upper motor neurons are located entirely within the central nervous system (CNS), specifically in the brain or spinal cord.

Recognize the role of lower motor neurons: Lower motor neurons have their cell bodies within the CNS (in the spinal cord or brainstem), but their axons extend outside the CNS to reach the target muscles.

Analyze the options provided: The axon of the lower motor neuron is the only part of the motor pathway that exits the CNS to innervate muscles. The axon of the upper motor neuron, cell body of the upper motor neuron, and dendrites of the upper motor neuron remain within the CNS.

Conclude that the correct answer is the axon of the lower motor neuron, as it is the portion of the motor pathway that exists outside the CNS.