PNB 2264 Reading Assignments
Questions and All Actual Answers
2026.
The role of the CSF is to do the following - Answer to provide neutral buoyancy to the CNS
What conclusion can be drawn by the fact that CSF is colorless? - Answer There cannot be
hemoglobin within the CSF
Damage to the ___ would prevent the flow of CSF from the spinal cord and brain. - Answer
Cerebral aqueduct
Arrange the following terms into the order in which a compound must pass through to move
from plasma to CSF - Answer 1-Capillary endothelium
2-Extracellular matrix
3-Pericyte
4-Astrocyte
Would a clot within the right carotid artery always cause a stroke within the brain? - Answer
No, the interconnections between blood vessels within the brain, would continue to provide
blood flow.
Which of the following is the most common type of neuron within the CNS? - Answer
Multipolar neuron
How could you distinguish whether a disease (or damage) to the CNS causes a loss or an over-
production of astrocytes? - Answer A loss of astrocytes would lead to over-excitability of
neurons, and over-production might lead to a decrease in neuron activity
What would happen if all microglia cells were lost from the CNS? - Answer Immune
surveillance within the CNS would be decreased.
Sensory neurons ____sensory information in to forms understandable by the ______ - Answer
transduce; central nervous system
Growth cones are guided by ______ - Answer chemotaxis of cues
, Proof for adult neurogenesis is found in the fact that - Answer 14 C was found to be
incorporated into the neurons of adult brains following atmospheric atomic tests that exposed
people to 14 C
Fetal neurons find their correct targets by _____ - Answer moving along radial glia
The precise path that axons take to their target cells is identical in all people - Answer False
A neural circuit involving communication between two or more cells could be further classified
as - Answer complex
Skeletal muscle is controlled by _____ circuits - Answer divergent
The minimal number of cells in a polysynaptic spinal cord reflex arc is - Answer 3
Which of the following divides the spinal cord into lateral sections - Answer dorsal medial
sulcus and ventral medial fissure
Efferent and afferent neurons pass through _____ to enter the spinal cord - Answer
intervertebral foramina
A dermatome is defined as - Answer a region of skin innervated by a particular spinal nerve
What is a plexus - Answer a braid-like structure intermingling motor, autonomic and sensory
neurons
A patient reports numbness in his left arm and was severely burned when his elbow was too
close to an open flame. What nerve plexus and nerve could be damaged? - Answer brachial
plexus and any one of the several nerves that innervate the arm
During a breech birth (feet first instead of head first), the attending physical was forced to use
forceps to grab the baby's leg and pull it out of the womb. Later examination of the baby
revealed damage to the toes, which could not abduct or adduct, and the flexion of the ankle
was impaired. What likely happened to the baby? - Answer The common fibular nerve was
damaged
Which fibers carry information from one brain hemisphere to the other? - Answer
commissural
Questions and All Actual Answers
2026.
The role of the CSF is to do the following - Answer to provide neutral buoyancy to the CNS
What conclusion can be drawn by the fact that CSF is colorless? - Answer There cannot be
hemoglobin within the CSF
Damage to the ___ would prevent the flow of CSF from the spinal cord and brain. - Answer
Cerebral aqueduct
Arrange the following terms into the order in which a compound must pass through to move
from plasma to CSF - Answer 1-Capillary endothelium
2-Extracellular matrix
3-Pericyte
4-Astrocyte
Would a clot within the right carotid artery always cause a stroke within the brain? - Answer
No, the interconnections between blood vessels within the brain, would continue to provide
blood flow.
Which of the following is the most common type of neuron within the CNS? - Answer
Multipolar neuron
How could you distinguish whether a disease (or damage) to the CNS causes a loss or an over-
production of astrocytes? - Answer A loss of astrocytes would lead to over-excitability of
neurons, and over-production might lead to a decrease in neuron activity
What would happen if all microglia cells were lost from the CNS? - Answer Immune
surveillance within the CNS would be decreased.
Sensory neurons ____sensory information in to forms understandable by the ______ - Answer
transduce; central nervous system
Growth cones are guided by ______ - Answer chemotaxis of cues
, Proof for adult neurogenesis is found in the fact that - Answer 14 C was found to be
incorporated into the neurons of adult brains following atmospheric atomic tests that exposed
people to 14 C
Fetal neurons find their correct targets by _____ - Answer moving along radial glia
The precise path that axons take to their target cells is identical in all people - Answer False
A neural circuit involving communication between two or more cells could be further classified
as - Answer complex
Skeletal muscle is controlled by _____ circuits - Answer divergent
The minimal number of cells in a polysynaptic spinal cord reflex arc is - Answer 3
Which of the following divides the spinal cord into lateral sections - Answer dorsal medial
sulcus and ventral medial fissure
Efferent and afferent neurons pass through _____ to enter the spinal cord - Answer
intervertebral foramina
A dermatome is defined as - Answer a region of skin innervated by a particular spinal nerve
What is a plexus - Answer a braid-like structure intermingling motor, autonomic and sensory
neurons
A patient reports numbness in his left arm and was severely burned when his elbow was too
close to an open flame. What nerve plexus and nerve could be damaged? - Answer brachial
plexus and any one of the several nerves that innervate the arm
During a breech birth (feet first instead of head first), the attending physical was forced to use
forceps to grab the baby's leg and pull it out of the womb. Later examination of the baby
revealed damage to the toes, which could not abduct or adduct, and the flexion of the ankle
was impaired. What likely happened to the baby? - Answer The common fibular nerve was
damaged
Which fibers carry information from one brain hemisphere to the other? - Answer
commissural
