Anatomy Quiz 1
The reflex that prevents a muscle from exerting too much tension is the __________ reflex.
tendon
Which of the following pairs is NOT properly matched?
lumbar spinal nerves: 4
The entire spinal cord is divided into __________ segments.
31
The spinal cord continues to elongate and enlarge until about age:
4 years
The following are the steps involved in a reflex arc: activation of a sensory neuron activation of a motor neuron response by an effector. arrival of a stimulus and activation of a receptor information processing The proper sequence of these steps is:
4, 1, 5, 2, 3
The ventral rami of spinal nerves C5 to T1 form the __________ plexus.
brachial
the ulnar nerve is found in which plexus?
brachial
The white matter of the spinal cord contains:
bundles of axons that share common origins, destinations, and functions
The reflex that complements a withdrawal reflex by making compensatory adjustments on the opposite side of the body receiving the stimulus is the __________ reflex.
crossed extensor
Spinal nerves from the sacral region of the cord innervate the __________ muscles.
leg
Spinal nerves are __________ nerves.
mixed
A nerve of the cervical plexus that innervates the diaphragm is the __________ nerve.
phrenic
Each of the following nerves is found in the lumbar plexus, EXCEPT the __________ nerve
sciatic
The specialized membranes that protect the spinal cord are termed:
spinal meninges
The dorsal and ventral roots of each spinal segment unite to form a:
spinal nerve
Muscles of the neck and shoulder are innervated by spinal nerves from the __________ region.
cervical
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 dorsal root ganglia contain:
cell bodies of sensory neurons
The outermost connective tissue covering of spinal nerves is the:
epineurium
The adult spinal cord extends only to which vertebral level?
first or second lumbar
Axons crossing from one side of the spinal cord to the other within the:
gray commissures
The projections of gray matter toward the outer surface of the spinal cord are called:
horns
Enlargements of the spinal cord occur:
in segments of the spinal cord that control the limbs
The preganglionic fibers that connect a spinal nerve with a sympathetic ganglion in the thoracic and lumbar region of the spinal cord are the:
white ramus