Saladin 6e Chapter 12 Nervous Tissue
Nervous System Set 2 Study online at quizlet. com/_6rnj1 2. What are the classifications of neurons? 3.
What are the four types of neuroglia in CNS? 4. What are the two types of fast axonal transport? 5. What are the two types of neuroglia in PNS? 7. What do brain tumors arise from? 8. What do schawnn cells do in PNS? 9. What does the neuroglia or glial cells do? 10. What guides microtubules along axon? 11. What is anaxonic neuron? 12. What is anterograde transport? 13. What is astrocytes? 14. What is axonal transport or axoplasmic flow? 1.
What are schwann cells? envelope nerve fibers in PNS. produce a myelin sheath multipolar, bipolar, unipolar and anaxonic oligodendrocytes, ependyal cells, microglia and astocytes Fast anterograde and fast retrograde. Occurs at a rate of 20 to 400 mm/day Schwann cells and satellite cells. masses of rapidly dividing cells. meninges (protective membrane of CNS), Metastasis from nonneuronal tumors in other organs. Often glial cells that are mitotically active throughout life spiral repeatedly around a single nerve fiber. support and protect the neurons.
Prevents neurons from touching eachother and gives precision to conduction pathways motor proteins (kinesin and dynein) carry materials “on their backs” while they “crawl” along microtubules many dendrites but no axon. Help in visual processes movement away from the soma down the axon maintain structure. “nerve growth factors” secreted by astrocytes promote neuron growth and synapse formation 0. 5 to 10 mm/day. always anterograde. moves enzymes governs speed of damged nerve fibers. two way passage along an axon 16. What is bipolar neuron? 17. What is dynein? 18. What is pendymal cells? 19. What is fast anterograde transport? 20. What is fast retrograde transport? 21. What is Initial segment? 22. What is Internodes? 23. What is kinesin? 24. What is microglia? 25. What is multipolar neuron? 26. What is myelin sheath? 27. What is myelination? 28. What is neurilemma? 29. What is nodes of Ranvier? 30. What is oligodendrocyes? 31. What is retrograde transport? 32. What is Satellite cells? 33. What is the trigger zone? 34. What is unipolar neuron? one axon and one dendrite. motor proteins in retrograde transport line internal cavities of the brain.
Secretes and circulates CSF (cerebrospinal fluid) “transport” moves mitochondria, synaptic vessicles, other organelles toward the distal end of the axon for recycled material and pathogens – rabies, herpes simplex, tetanus, polio virus. The short section of nerve fiber between the axon hillock and the first glial cell the myelin covered segments from one gap to the next motor proteins in anteograde transport. (supply) “soldier” small, wondering macophages formed white blood cell called monocytes one axon, multiple dendrites. Most common, most neuron in brain and spinal cord an insulating layer around a nerve fiber. s segmented production of the myelin sheath. thick outermost coil of myelin sheath. contains nucleus and most of its cytoplasm. gaps between the segments of myelin sheath form myelin sheathes in CNS. forms an insulating layer that speed up signal conduction movement up the axon toward the soma surround neurosoms in ganglia of PNS. provide electrical insulation around soma. Regulate chemical environment of the neuron the axon hillock and initial segment single process leading away from the soma. Sensory from skin and organs to spinal cord 6. What are tumors? 15. what is axonal transport?