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