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20 Cards in this Set

  • Front
  • Back
when does the neural tube begin to form?
end of the 3rd week
What do neural crest cells give rise too? (2)
Schwann cell and the adrenal medulla
Where is ependyma and what does it do?
Ependyma is in the spinal chord and ventricals of the brain. It is implicated inthe production of CSF.
What are the three layers of the neural tube?
ependymal, mantle, marginal
What layer of the neural tube gives rise to the posterior and anterior spinal horns?
mantle layer
What layer of the spinal chord is gray matter derived from? What about white?
Gray- mantle
What is wallarian degeneration?
distal degeneration of axons and their myelin sheaths secondary to injury to the neuron cell body
What is collateral nerve regeneration?
When branches of an undamaged axon enter into an adjascent denervated neurilemma chord
What is the most abundant intracellular cation?
what is the maximum depolarization of a nerve
How many lumbar nerves are there?
What does the lumbrosacral plexus innervate?
The thigh and the foot
What are the four main spinal plexi?
cervical, brachial, lumbosacral, pudendal
Where is Ach released and what system controls it?
released at the nicotinic receptor atthe adrenal medulla by the sympathetic system
what do nicotine, carbamylcholine and metacholin all have in common?
they are all nicotinic agents
what do alpha 1 receptors mediate?
where is the control system for heartbeat respiration and blood pressure
what is the major voluntary motor pathway from the cerebrum to the spinal chord?
pyramidial tracts
where is the VPL nucleus located and where does it receive sensory information from?
thalamus; sensory info from the internal aruate fibers
what does the reticular formation contain and what does it do?
It contains the cardiac, vasomotor and respiratory center. It keeps the cerebrum alert.