CHAPTER 7 NERVOUS SYSTEM
What cells from the myelin sheaths around nerve fibers in the PNS?
Schwann cells
Complex networks of spinal nerves are termed nerve plexuses.
TRUE
Ganglia are collections of ________.
cell bodies
Impulses for the sense of smell are carried by this purely sensory pair of cranial nerves
cranial nerve I
This cranial nerve pair is tested with the use of a penlight to gauge the responsiveness of the pupils
cranial nerve III
This cranial nerve pair contains motor fibers that activate the chewing muscles
cranial nerve V
This cranial nerve pair transmits sensory information about balance and hearing
cranial nerve VIII
Which ciliated neuroglial cell circulates cerebrospinal fluid?
ependymal cells
What are the two major functional properties of neurons?
irritability and conductivity
The brain and spinal cord are protected and cushioned by three connective tissue membranes that are collectively called______
meninges
Support cells in the central nervous system are collectively called ______
neuroglia
Which cranial nerve pairs are purely motor and control eye movement?
oculomotor, trochlear, abducens
No affect on most blood vessels
parasympathetic nervous system
The hypothalamus regulates the _______
pituitary gland
What are the two main functional subdivisions of the nervous system?
sensory and motor
A polarized neuron is characterized by the presence of more_________ ions along the plasma membrane outside the cell and less _______ ions along the plasma membrane inside the cell
sodium; potassium
What congenital disorder results when the vertebrae fail to form completely around the spinal cord, typically in the lumbosacral region?
spina bifida
Which branch of the autonomic nervous system system (ANS) mobilizes the body during extreme situations, such ass rage or fear
sympathetic division
Decreases digestive system activities
sympathetic nervous system
Increases the release of epinephrine from the adrenal medulla
sympathetic nervous system
Myelinated fibers (tracts) form ________ matter while unmyelinated fibers form ________ matter.
white; gray
What brain dysfunction results when blood supply to a region (or regions) of the brain is blocked and vital brain tissue dies, as by a blood clot or a ruptured blood vessel?
Cerebrovascular Accident
A sensory neuron carries stimuli from the central nervous system to the effector.
FALSE
Obligodendrocytes form the myelin sheath around nerve fibers in the PNS
FALSE
One of the major functions of the pons is to regulate hormonal output of the anterior pituitary gland.
FALSE
The central nervous system includes the spinal nerves and cranial nerves
FALSE
What type of neuron connects sensory and motor neurons in neural pathways?
Interneuron or association neuron
Subdivision of the motor division responsible for controlling involuntary events
autonomic nervous system (ANS)
The part of the neuron that typically conducts nerve impulses away from the cell body is the_______
axon
What part of the neuron releases vesicles containing neurotransmitters?
axon terminals
