Ch. 13 The Peripheral Nervous System and Reflex Activity

Hoehn - Marieb Human Anatomy & Physiology, 12th edition

Hoehn, Haynes, Abbott12th EditionMarieb Human Anatomy & PhysiologyISBN: 9780138242732Not the one you use?Change textbook

Hoehn, Haynes, Abbott 12th Edition

Ch. 13 The Peripheral Nervous System and Reflex Activity

Problem 9

Chapter 13, Problem 9

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

Step 1: Understand the structure of a nerve. A nerve is composed of multiple bundles called fascicles, which contain individual nerve fibers (axons). Each level of organization is surrounded by a specific connective tissue sheath.

Step 2: Identify the connective tissue layers associated with nerves: the endoneurium surrounds individual nerve fibers, the perineurium surrounds each fascicle (bundle of nerve fibers), and the epineurium surrounds the entire nerve.

Step 3: Recall that the epimysium is a connective tissue sheath, but it surrounds muscle, not nerve structures.

Step 4: Match the connective tissue sheath to the fascicle of nerve fibers. Since the fascicle is a bundle of nerve fibers, the sheath that surrounds it is the perineurium.

Step 5: Conclude that the correct answer is the perineurium, which is the connective tissue sheath surrounding a fascicle of nerve fibers.

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Key Concepts

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

Nerve Fiber Organization

Nerve fibers are grouped into bundles called fascicles, which are surrounded by connective tissue layers. Understanding this hierarchical structure is essential to identify the specific sheath that encloses a fascicle.

Perineurium

The perineurium is the connective tissue sheath that specifically surrounds each fascicle of nerve fibers, providing protection and maintaining the internal environment of the nerve bundle.

Other Connective Tissue Sheaths in Nerves

Epineurium surrounds the entire nerve, endoneurium encloses individual nerve fibers, and epimysium surrounds muscle tissue. Differentiating these layers helps in correctly identifying the sheath around a fascicle.

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Textbook Question

Match the names of the cranial nerves in column B to the appropriate description in column A.

Column A

_______ (1) Causes pupillary constriction

_______ (2) The major sensory nerve of the face

_______ (3) Serves the sternocleido-mastoid and trapezius muscles

_______ (4) Purely sensory (two nerves)

_______ (5) Serves the tongue muscles

_______ (6) Allows you to chew your food

_______ (7) Impaired in Bell's palsy

_______ (8) Helps regulate heart activity

_______ (9) Helps you hear and maintain your balance

_______ (10) Contain parasympathetic motor fibers (four nerves)

Column B

a. Abducens

b. Accessory

c. Facial

d. Glossopharyngeal

e. Hypoglossal

f. Oculomotor

g. Olfactory

h. Optic

i. Trigeminal

j. Trochlear

k. Vagus

l. Vestibulocochlear

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Textbook Question

Match the receptor type in column B to the correct description in column A.

Column A

______ (1) Pain, itch, and temperature receptors

______ (2) Contains intrafusal fibers and anulospiral and flower spray endings

______ (3) Discriminative touch receptor in hairless skin (fingertips)

______ (4) Contains receptor endings wrapped around thick collagen bundles

______ (5) Rapidly adapting deep-pressure receptor

______ (6) Slowly adapting deep-pressure receptor

Column B

a. Bulbous corpuscles

b. Tendon organ

c. Muscle spindle

d. Free nerve endings

e. Lamellar corpuscle

f. Tactile corpuscle