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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2:06 minutes

Problem 5

Textbook Question

The connective tissue sheath that surrounds a fascicle of nerve fibers is the
a. Epineurium
b. Endoneurium
c. Perineurium
d. Epimysium

Verified step by step guidance

Understand the structure of a nerve: Nerves are composed of bundles of nerve fibers (axons) organized into fascicles, which are surrounded by connective tissue sheaths.

Learn the three main connective tissue layers in nerves: The epineurium surrounds the entire nerve, the perineurium surrounds each fascicle, and the endoneurium surrounds individual nerve fibers within a fascicle.

Eliminate options based on definitions: The epineurium surrounds the entire nerve, so it cannot be the sheath for a fascicle. The endoneurium surrounds individual nerve fibers, not fascicles. The epimysium is related to muscles, not nerves.

Focus on the perineurium: The perineurium is the connective tissue sheath that specifically surrounds a fascicle of nerve fibers, providing protection and maintaining the blood-nerve barrier.

Confirm the correct answer: Based on the definitions and elimination process, the correct answer is c. perineurium.

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Key Concepts

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

Fascicle

A fascicle is a bundle of nerve fibers (axons) grouped together within a nerve. Each fascicle is surrounded by a protective sheath, which plays a crucial role in maintaining the integrity and function of the nerve fibers it contains.

Perineurium

The perineurium is the connective tissue sheath that encases each fascicle of nerve fibers. It provides structural support and protection, as well as a barrier to maintain the internal environment of the nerve fibers, ensuring proper nerve function.

Connective Tissue Sheaths

Connective tissue sheaths, including the epineurium, perineurium, and endoneurium, are layers of connective tissue that surround and protect nerve fibers. Each layer has distinct functions, with the epineurium surrounding the entire nerve, the perineurium surrounding fascicles, and the endoneurium surrounding individual nerve fibers.