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

4. Tissues & Histology

Introduction to Nervous Tissue

Anatomy & Physiology

4. Tissues & Histology

Introduction to Nervous Tissue

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Multiple Choice

The lower motor neurons that innervate contractile skeletal muscle fibers are called:

gamma motor neurons

interneurons

sensory neurons

alpha motor neurons

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Verified step by step guidance

Understand the role of lower motor neurons: Lower motor neurons are responsible for directly stimulating skeletal muscle fibers to contract. They are located in the spinal cord and brainstem and send signals to muscles via their axons.

Differentiate between alpha and gamma motor neurons: Alpha motor neurons innervate the extrafusal muscle fibers, which are the primary contractile units of skeletal muscles. Gamma motor neurons, on the other hand, innervate intrafusal muscle fibers within muscle spindles, which are involved in proprioception and muscle tone regulation.

Eliminate incorrect options: Interneurons are not motor neurons; they act as relay neurons within the central nervous system. Sensory neurons transmit sensory information to the central nervous system but do not directly innervate skeletal muscle fibers.

Focus on the correct option: Alpha motor neurons are the specific type of lower motor neurons that directly innervate extrafusal skeletal muscle fibers, causing them to contract.

Conclude with the correct answer: Based on the explanation, the lower motor neurons that innervate contractile skeletal muscle fibers are alpha motor neurons.