CH16 + CH17 Test Bank Questions

Which of the following are not true regarding the sciatic nerve? It does NOT: 1. sends branches to the hamstring muscles. 2. is the largest nerve in the body. 3. arises from the lumbar plexus. 4. splits at about the level of the knee into tibial and common fibular nerves

3

Which of the following is NOT a correct description of the location of the brachial plexus? 1. extends inferiorly and laterally on either side of the last few cervical and first thoracic vertebrae 2. enters the axilla 3. on the neck alongside the first four cervical vertebrae 4. passes above the first rib posterior to the clavicle

3

A typical reflex arc involves the following components: 1. sensory neuron 2. motor neuron 3. sensory receptor 4. integrating center 5. effector The correct order is:

3, 1, 4, 2, 5

There are _____ pairs of spinal nerves, consisting of the following groups: _____ pairs of cervical, _____ pairs of thoracic, _____ pairs of lumbar, _____ pairs of sacral, and _____ pair of coccygeal spinal nerves.

31, 8, 12, 5, 5, 1

_____ (or sensory) impulses travel from the _____ to the _____.

Afferent, receptors, central nervous system

_____ (or motor) impulses travel from the _____ to the _____ (muscles or glands).

Efferent, central nervous system, effectors

Select the muscle(s) served by the obturator nerve.

adductor muscles of thigh

Accidentally stepping on a nail with the sole of your foot causes you quite a bit of discomfort. Which type of pathway is involved in relaying information about the nail to the central nervous system?

afferent (sensory)

(about the pink layer of the nerve) The meninx indicated by the line is the _____

arachnoid matter

Which neuroglia would be most responsible for helping to prevent pathogens and toxins from entering the brain from the blood?

astrocytes

What is the best description of the subarachnoid space?

between arachnoid matter and pia matter

From which plexus does the long thoracic nerve arise?

brachial

From which plexus does the ulnar nerve arise?

brachial

From which plexus does the phrenic nerve arise?

cervical

The main plexuses formed by the anterior (ventral) rami of spinal nerves are:

cervical, brachial, lumbar, and sacral.

The white matter of the spinal cord

contains ascending (sensory) and descending (motor) tracts.

What is the best description of the pia mater?

contains blood vessels that supply oxygen and nutrients to the spinal cord

The peripheral nervous system includes:

cranial nerves and their branches spinal nerves and their branches ganglia

Select the structure(s) served by the axillary nerve.

deltoid muscle

Select the structure(s) served by the phrenic nerve.

diaphragm

In order to flex your fingers, which type of impulse will the flexor digitorum superficialis muscle need to receive?

efferent (motor)

Select the muscle(s) served by the femoral nerve.

extensor muscles of knee joint

Select the best description of axon terminals:

fine processes at the ends of an axon

Select the structure(s) served by the median nerve.

flexors of the wrist

A _____ refers to a small mass of nervous tissue, consisting primarily of neuron cell bodies, outside of the brain and spinal cord.

ganglion

Select the muscle(s) served by the tibial nerve.

gastrocnemius and soleus muscles

Select the muscle(s) served by the inferior gluteal nerve.

gluteus maximus

The central canal of the spinal cord is located in the center of the:

gray commissure

Motor impulses that help maintain muscle tone and posture are conveyed from the brain through the spinal cord by the:

indirect pathways

The gray matter of the spinal cord

is subdivided into regions called horns. contains neuronal cell bodies. is surrounded by white matter.

The senses of pain and temperature are conveyed to the brain by:

lateral spinothalamic tracts.

From which plexus does the femoral nerve arise?

lumbar

Diverging circuits allow for transmission of nerve impulses from _____ neuron(s) to _____ neuron(s).

one, several

Which of the following contain cell bodies of interneurons?

posterior (dorsal) gray horns

( cut vertebrae pointing to a yellow nerve that looks like a sperm inside the hole of the vertebrae) The part of the spinal cord indicated by the line is the _____

posterior (dorsal) root

Which of the following contains sensory information ONLY?

posterior (dorsal) root

From which plexus does the superior gluteal nerve arise?

sacral

Which of the following convey information from the central nervous system (CNS) to skeletal muscles only?

somatic motor neurons

The two main routes for sensory information traveling up the spinal cord to the brain are _____ tracts and _____ columns.

spinothalamic, posterior

Cerebrospinal fluid is found between two layers of the meninges, in a space called the _____.

subarachnoid space

Spinal nerves T2-T12 differ from all other spinal nerves in that:

the anterior (ventral) rami do not contribute to a plexus.

Which structure of the neuron will contain the greatest number of neurotransmitter receptors?

the dendrites

The conus medullaris is:

the tapering end of the spinal cord inferior to the lumbar enlargement.

Select the muscle(s) served by the common fibular nerve.

tibialis anterior and fibularis (peroneal) muscles

Select the structure(s) served by the radial nerve.

triceps brachii

A synapse is a functional junction between:

two neurons. a neuron and a glandular cell. a neuron and a muscle cell.

Select the best description of dendrites:

usually short and branched