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20 Cards in this Set
- Front
- Back
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when does the neural tube begin to form?
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end of the 3rd week
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What do neural crest cells give rise too? (2)
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Schwann cell and the adrenal medulla
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Where is ependyma and what does it do?
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Ependyma is in the spinal chord and ventricals of the brain. It is implicated inthe production of CSF.
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What are the three layers of the neural tube?
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ependymal, mantle, marginal
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What layer of the neural tube gives rise to the posterior and anterior spinal horns?
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mantle layer
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What layer of the spinal chord is gray matter derived from? What about white?
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Gray- mantle
white-marginal |
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What is wallarian degeneration?
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distal degeneration of axons and their myelin sheaths secondary to injury to the neuron cell body
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What is collateral nerve regeneration?
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When branches of an undamaged axon enter into an adjascent denervated neurilemma chord
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What is the most abundant intracellular cation?
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K+
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what is the maximum depolarization of a nerve
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+40
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How many lumbar nerves are there?
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5
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What does the lumbrosacral plexus innervate?
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The thigh and the foot
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What are the four main spinal plexi?
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cervical, brachial, lumbosacral, pudendal
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Where is Ach released and what system controls it?
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released at the nicotinic receptor atthe adrenal medulla by the sympathetic system
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what do nicotine, carbamylcholine and metacholin all have in common?
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they are all nicotinic agents
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what do alpha 1 receptors mediate?
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vasoconstriction
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where is the control system for heartbeat respiration and blood pressure
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medulla
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what is the major voluntary motor pathway from the cerebrum to the spinal chord?
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pyramidial tracts
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where is the VPL nucleus located and where does it receive sensory information from?
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thalamus; sensory info from the internal aruate fibers
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what does the reticular formation contain and what does it do?
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It contains the cardiac, vasomotor and respiratory center. It keeps the cerebrum alert.
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