Practice quiz Flashcards
Which of the following is damaged when there is damage to the structural support of the neuron?
cytoskeleton
Which structure increases the surface area of the part of the neuron that transmits signals TOWARD the cell body?
dendritic spines
Which cell is responsible for myelination of axons of spinal nerves?
schwann cell
Which letter on the diagram to the right indicates the postsynaptic potential which makes it MORE LIKELY that an action potential will occur?
A
Which of the following is an inhibitory neurotransmitter?
GABA
A patient had damage to the area surrounding the spinal cord. She has lost sensation of the area damaged. Which structure was affected?
dorsal roots
The ventral grey column contains:
motor neurons and interneurons
Which arteries give rise to the anterior and posterior spinal arteries?
vertebral arteries
The lobe of the brain that surrounds the corpus callosum and diencephalon on the medial aspect of the cerebral cortex is:
the limbic lobe
Which of the following is the largest group of commissural fibers?
corpus callosum, which connects the two hemispheres
Spinal nerves can be impinged as they exit the vertebral column if there is narrowing of which of the following?
inervertebral foramina
A column of white matter bounded by sulci and fissures within the spinal cord is called a:
funiculus
Which arteries give rise to the anterior and posterior spinal arteries?
vertebral arteries
The lobe that forms the floor of the lateral sulcus is:
the insula
The internal capsule is the most prominent group of projection fibers, meaning that they do which of the following?
connect higher levels of the cerebral hemisphere to lower levels on the same side
CSF flows under which of the following layers?
arachnoid mater
Which of the following spaces contain venous blood?
dural sinuses
The CSF flows into the blood through which structure?
arachnoid granulations
80% of cerebral blood flow comes from ______ and 20% comes from _______.
Internal carotid artery, vertebral arteries
The posterior cerebral arteries are formed by which?
basilar artery
The term leptomeninges refers to which of the following?
The arachnoid mater and the pia mater
Which of the following spaces contain CSF?
ventricles of the brain
subarachnoid space
arachnoid cisterns
The CSF is manufactured by which structure?
choroid plexus
The posterior cerebral arteries are formed by which?
basilar artery
Damage to the reticular formation could cause which of the following?
abnormal control of consiousness
The pyramidal decussation is the location of which of the following?
crossing of motor tracts
If a patient has damage to the brainstem, which of the following cranial nerves will definitely be spared?
CN I, olfactory nerve
Which of the following nerves control eye movements?
CN III
CN VI
CN IV
A baby is born with a mass in the lower sacral area and there is suspicion of a neural tube defect. Which of the following deficits is most likely if the spinal cord structures are involved?
Sensory and motor deficits in the lower extremities bilaterally
During the action potential, depolarization occurs when which of the following occur?
Na flows into the cell
A patient has a condition which causes insufficient levels of the neurotransmitter GABA in the brain. Knowing the usual role of GABA, what signs would you expect from its deficiency?
Overfiring of neurons causing conditions such as seizures or spasticity
A patient has a condition in which his anterior funiculus is damaged. This will affect which of the following signals?
Sensory and motor signals
A patient demonstrates weakness of four extraocular muscles of the left eye. As the student examines the patient, she also expects to find which of the following?
Left pupillary dilation
As a student examines a patient’s cranial nerves, she finds that the patient is unable to identify objects in the temporal visual fields. Which nerve is affected?
CN I
