CNS Cell Types Flashcards
Name the 2 categories of CNS cells?
NEURONS
+
NEUROGLIA
Neurons are _______________ nervous system cells, which perform the function of transmitting information.
PARENCHYMAL
________ cell types are regenerating (hair).
LIBLE
_________ cell types can regenerate (visceral organs).
STABLE
__________ cell types include neurons and mm fibers.
PERMANENT
Neurons are a _______________ cell type, meaning unreplicatable, well supplied with blood and immunity, and very resilient in repairing non-fatal injuries.
PERMANENT
Will axon injury result in cell death in the PNS?
NOt necessarily
Will axon injury result in cell death in the CNS?
YES
What determines whether an axon is in the CNS or PNS?
IVF
Intervertebral Foramen
What is the aka for cell membrane?
NEUROLEMA
What is the term when a PNS axon encounters a lesion, and degenerates the distal part of the axon?
WALLERIAN DEGENERATION
fatal axonal injury in the PNS
How long does it take for repair to begin where wallerian degeneration is taking place?
7 - 10 DAYS
How much will the axon grow each day after wallerian degeneration?
1 - 2 mm REPAIR PER DAY
for 6 ish months
What covers the damaged endonurium during wallerian degeneration?
SCHWANN CELLS
Name the myelin producing cells of the CNS?
OLIGODENDROCYTE
What is the term for a fatal axonal injury in the CNS?
RETROGRADE DEGENERATION
What occurs during retrograde degeneration in the CNS?
CELL BODY LIVES 1 -2 YEARS \+ CANNOT RETURN TO PREV FUNCTION \+ EVENTUALLY DIES
Name the 4 types of neuroglia in the CNS?
stable cell types
MICROGLIA \+ ASTROCYTES \+ EPENDYMAL \+ OLIGODENDROCYTES
Microglia are ___________ system cells, resident in the CNS tissues.
IMMUNE
Name the 3 main functions of astrocytes?
- BLOOD BRAIN BARRIER
- STRUCTURAL SUPPORT
- GLIOSIS
How many neurons does each alcoholic drink kill?
125 000 (long term alcoholics develop brain damage)
The BBB is good at blocking organics, but NOT good at blocking what?
SYNTHETICS
What to ependymal cells create and deposit into vetricles, and the spinal cord?
CEREBROSPINAL FLUID
CSF
What myelinates an axon?
OLIGODENDROCYTES
