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

Which structure, when present around a neuron, increases the rate of impulse conduction?

Endoneurium

Myelin sheath

Neurofibril

Nissl body

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Verified step by step guidance

Step 1: Understand the function of the myelin sheath. The myelin sheath is a fatty layer that wraps around the axons of certain neurons. Its primary role is to insulate the axon and increase the speed of electrical impulse conduction through a process called saltatory conduction.

Step 2: Compare the myelin sheath to the other structures listed. The endoneurium is a connective tissue layer that surrounds individual nerve fibers but does not directly affect impulse conduction speed. Neurofibrils are structural components within the neuron that provide support but do not influence conduction speed. Nissl bodies are involved in protein synthesis within the neuron and are unrelated to impulse conduction.

Step 3: Recognize the mechanism of saltatory conduction. In neurons with a myelin sheath, electrical impulses jump between nodes of Ranvier (gaps in the myelin sheath), significantly increasing conduction speed compared to unmyelinated neurons.

Step 4: Identify the correct answer based on the function of the listed structures. The myelin sheath is the structure that increases the rate of impulse conduction, as it facilitates faster transmission of electrical signals along the axon.

Step 5: Reinforce the concept by noting that diseases like multiple sclerosis, which damage the myelin sheath, result in slower impulse conduction and neurological impairments, highlighting the importance of this structure in normal neural function.