Practice Ch 13

Which branch carries motor neurons to structures on the back of the body trunk?

1

In which structure are sensory cell bodies located?

10

The spinal cord consists of five regions and ________ segments.

31

What is the correct order of passage for visceral motor fibers on their way to a spinal nerve?(1) autonomic ganglion (2) ventral root (3) gray ramus (4) lateral gray horn (5) white ramus

4, 2, 5, 1, 3

The ventral root of a spinal nerve contains

axons of motor neurons

The dorsal root of a spinal nerve contains

axons of sensory neurons

The ventral rami of spinal nerves C5 to T1 contribute fibers to the ________ plexus.

brachial

The dorsal root ganglia mainly contain

cell bodies of sensory neurons.

The body surface region monitored by a specific pair of spinal nerves is called (a)

dermatome

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

dorsal ramus

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

dura mater

The outermost connective-tissue covering of nerves is the

epineurium

The gray horns of the spinal cord contain mainly

nerve cell bodies

The ________ nerve, which arises in the cervical plexus, innervates the diaphragm.

phrenic

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

pia mater

Identify the structure labeled "4."

posterior gray horn

Identify the structure labeled "1."

posterior white column

Identify the structure labeled "5."

rami communicantes

The largest nerve in the body that is formed from L4-S3 is the

sciatic

If the dorsal root of a spinal nerve is severed,

sensory input would be blocked.

The posterior horns of the spinal cord contain mainly

sensory nuclei

What is the function of the structure labeled "13"?

somatic motor control

The anterior horns of the spinal cord contain mainly

somatic motor nuclei

What is the function of the structure labeled "12"?

somatic sensory receiving

The specialized membranes that surround the spinal cord are termed the

spinal meninges

A dorsal and ventral root of each spinal segment unite to form a

spinal nerve

Cerebrospinal fluid flows within the

subarachnoid space.

The subdural space lies between

the dura mater and the arachnoid mater.

Identify the structure labeled "2."

ventral ramus

The ________ innervates the ventrolateral body surface, structures in the body wall, and the limbs.

ventral ramus