Neuroscience Exam 1
Study online at https://quizlet.com/_byho2s
1. What are the components of the PNS and CNS? PNS: ganglia outside CNS and pe-
ripheral nerves
CNS: brain and spinal cord
2. What are the 7 major divisions of the CNS? -cerebral hemispheres
-diencephalon
-midbrain
-pons
-cerebellum
-medulla
-spinal cord
3. Describe the flow of information through a neu- dendrite>soma> axon> terminal
ron? (synapse)
4. Where are action potentials initiated? axon hillock
5. Where in a neuron is the greatest concentration segment of axon prior to first seg-
of voltage gated ion channels? ment of myelin (initial segment)
6. What myelinates axons in the CNS? oligodendrocytes
7. What are two cells similar/analogous to oligo- satellite cells (DRG) and schwann
dendrocytes? cells (PNS)
8. Greater concentrations of voltage gated ion nodes of ranvier
channels are found at nodes of ranvier or myeli-
nated segments?
9. Describe saltatory conduction AP jumps from node to node along
nodes of ranvier down a myelinated
axon (faster than unmyelinated)
10.
, Neuroscience Exam 1
Study online at https://quizlet.com/_byho2s
True or false: unmyelinated axons in the PNS true! schwann cells can be associ-
can be associated with glial cells ated w/ unmyelinated axons to en-
sheath multiple axons
11. What surrounds individual axons and neu- endoneurium
rolemma?
12. What is the outermost covering of a nerve sur- epineurium
rounding several fascicles with vasculature and
lymphatics?
13. True or false: nerve bundles in the CNS have false! they have astrocytes provid-
connective tissue coverings ing longitudinal paths surrounding
nerve bundles
14. What is the ratio of glia to neurons in the brain? 10:1 (glia: neurons)
15. What do astrocytes form in response to brain gliotic scars
injury?
16. What are the two types of astrocytes? protoplasmic and fibrous
17. What type of astrocytes are found in grey mat- protoplasmic astrocytes
ter?
18. List some functions of astrocytes? -borders of brain and other struc-
tures
-structural support
-ionic balance
-immune response
-NT removal
-synthesis and secretion of growth
factors & interleukins
-neuropeptide synthesis
Study online at https://quizlet.com/_byho2s
1. What are the components of the PNS and CNS? PNS: ganglia outside CNS and pe-
ripheral nerves
CNS: brain and spinal cord
2. What are the 7 major divisions of the CNS? -cerebral hemispheres
-diencephalon
-midbrain
-pons
-cerebellum
-medulla
-spinal cord
3. Describe the flow of information through a neu- dendrite>soma> axon> terminal
ron? (synapse)
4. Where are action potentials initiated? axon hillock
5. Where in a neuron is the greatest concentration segment of axon prior to first seg-
of voltage gated ion channels? ment of myelin (initial segment)
6. What myelinates axons in the CNS? oligodendrocytes
7. What are two cells similar/analogous to oligo- satellite cells (DRG) and schwann
dendrocytes? cells (PNS)
8. Greater concentrations of voltage gated ion nodes of ranvier
channels are found at nodes of ranvier or myeli-
nated segments?
9. Describe saltatory conduction AP jumps from node to node along
nodes of ranvier down a myelinated
axon (faster than unmyelinated)
10.
, Neuroscience Exam 1
Study online at https://quizlet.com/_byho2s
True or false: unmyelinated axons in the PNS true! schwann cells can be associ-
can be associated with glial cells ated w/ unmyelinated axons to en-
sheath multiple axons
11. What surrounds individual axons and neu- endoneurium
rolemma?
12. What is the outermost covering of a nerve sur- epineurium
rounding several fascicles with vasculature and
lymphatics?
13. True or false: nerve bundles in the CNS have false! they have astrocytes provid-
connective tissue coverings ing longitudinal paths surrounding
nerve bundles
14. What is the ratio of glia to neurons in the brain? 10:1 (glia: neurons)
15. What do astrocytes form in response to brain gliotic scars
injury?
16. What are the two types of astrocytes? protoplasmic and fibrous
17. What type of astrocytes are found in grey mat- protoplasmic astrocytes
ter?
18. List some functions of astrocytes? -borders of brain and other struc-
tures
-structural support
-ionic balance
-immune response
-NT removal
-synthesis and secretion of growth
factors & interleukins
-neuropeptide synthesis
