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Test 3

The __________ is part of the CNS and the __________ is part of the PNS

Spinal cord; spinal nerve

The dorsal root ganglia consist mainly of __________.

cell bodies of unipolar neurons

The cerebrospinal fluid (CSF) circulates within the __________.

subarachnoid space

The CSF is confined between the __________ and the __________.

pia mater; arachnoid mater

The ________ of each spinal nerve innervates the skin and muscles of the back.

Dorsal Ramus

The outermost connective-tissue covering of nerves is the


If a person has a crush injury to the C3-C5 spinal segments, you would expect that he

might be unable to breathe on his own

The spinal cord is part of the

central nervous system

Spinal nerves are

both sensory and motor

The dorsal root ganglia mainly contain

cell bodies of sensory neurons

The ventral root of a spinal nerve contains

axons of motor neurons

The tough, fibrous, outermost covering of the spinal cord is the

dura mater

The layer of the meninges in direct contact with the spinal cord is the

pia mater

In meningitis,bacteria can be the cause.
inflammation of the meninges occurs.
CSF flow can be disrupted.
viruses can be the cause.
All of the answers are correct

All of the answers are correct

Cerebrospinal fluid flows within the

subarachnoid space

The specialized membranes that surround the spinal cord are termed the

spinal meninges

Blood vessels that supply the spinal cord run along the surface of the

pia mater

Which of these is absent in the gray matter of the spinal cord?

myelinated axons

The white matter of the spinal cord is mainly

myelinated and unmyelinated axons

The anterior horns of the spinal cord contain mainly

somatic motor nuclei

Which nerve plexus innervates the pectoral girdle and upper limbs?

Brachial plexus

Which of these cervical plexus nerves innervates the diaphragm?

Phrenic Nerve

Which nerve does NOT belong to the sacral plexus?
obturator nerve
fibular nerve
sciatic nerve
tibial nerve

obturator nerve

What area of the body does the obturator nerve serve?

Skin over the medial surface of the leg

The region of the body surface monitored by a pair of spinal nerves is known as a(n) __________.


A typical spinal nerve has a __________ ramus consisting of unmyelinated axons that innervate smooth muscles.


The preganglionic fibers that connect a spinal nerve with an autonomic ganglion in the thoracic and lumbar region of the spinal cord and carries visceral motor fibers that are myelinated form the

white rami communicantes

A reflex that leads to secretion of saliva is a(n) __________ reflex.


A reflex arc always includes

a sensory receptor, afferent axon and efferent axon

Reflexes can be classified according to all of the following, except

whether they are sensory or motor

The reflex that limits muscle tension is the __________ reflex.


The __________ reflex involves activating muscles contralateral to the receptor.

crossed extensor

The reflex that prevents a muscle from exerting too much tension is the ________ reflex.


The ________ reflex complements the flexor reflex by activating contralateral muscles.

crossed extensor

Which of the following is not true about a positive Babinski reflex?

why you close your eyes when you sneeze

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