Cellular Constituents of the Nervous System Flashcards Preview

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Flashcards in Cellular Constituents of the Nervous System Deck (15)
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1

what is the most common type of neuron

- multipolar

2

where are bipolar neurons found

- peripheral ganglia
- retina

3

what type of neuron is described by an axon that has split into two branches; one branch runs to the periphery and the other to the spinal cord.

where is it found?

- pseudounipolar



- dorsal root ganglia

4

which cells lay down a basal lamina

importance of this

- Schwann cells

- helps axons regenerate
- axons regrow within the basal lamina tube

5

regulation of the extracellular fluid volume is dependent on the

problems with this can result in

- K+ and Na+ ionic gradients


- edema

6

crush injures versus nerve transections, which result in more accurate reinnervation

- crush injuries

7

what is the name of the clinical condition where regenerating axons reinnervate incorrect targets

- anomalous reinnervation

8

why can't CNS neurons regenerate

- oligodendrocytes lack a basal lamina
- inhibitory factors released by glia deter reinnervation

9

which system CNS/PNS remyelinates

- CNS

10

what occurs when axon members acquire new voltage-gated Na+ channels in demyelinated regions to restore function

- molecular plasticity

11

what occurs when synapses are strengthened due to increased activity

- synaptic plasticity

12

what occurs when targets which become partially denervated can receive axon collaterals from the remaining axons to the denervated portion of the tissue

- plasticity

13

what occurs when new neurons are produced from undifferentiated progenitor cells

- neurogenesis

14

what moves in the anterograde direction in transport

- newly synthesized proteins
- organelles
- neurotransmitter precursors

15

what moves in the retrograde direction in transport

- molecules designed for degradation in lysosomes
- viruses