Microglia are associated with a. small caliber central axons b. small caliber pe
ID: 226641 • Letter: M
Question
Microglia are associated with a. small caliber central axons b. small caliber peripheral axons c. small diameter neuronal cell bodies d. small diameter peripheral cell bodies e. phagocytosis Which of the following is NOT true of Schwann cells: a. a single large myelinated axon may be enveloped by many Schwann cells b. a single small unmyelinated axon may be enveloped by many Schwann cells c. a single Schwann cell may envelope more than one myelinated axon d. a single Schwann cell may envelope more than one unmyelinated axon e. none of the above Which of the following is/are true of both glia and neurons? a. they both have excitable membranes b. they both make synaptic connections c. they both are incapable of mitosis in adults d. all the above e. none of the above. Which type of glial cells is responsible for the myclination of dendrities in the central nervous system? a. astrocyte b. Schwann cell c. oligodendrocyte d. microglia e. none of the above Compared to the gray matter, white matter of neural tissues has a. many more synapses b. much more myelin c. many more neuronal cell bodies d. all the above e. none of the above The dural layer of the spinal cord meninges is continuous with which layere of peripheral nerve connective tissue? a. perineurium b. epineurium c. endoneurium d. none of the above e. all of the above A pathway which took you through pia, arachnoid, and dura, in that order, would be traversed if you went from a. the brain to the skull b. the skull to the brain c. either direction d. none of the above e. all of the above.Explanation / Answer
1. Phagocytosis. Activated phagocytic microglia are the maximally immune responsive form of microglia. Phagocytic microglia travel to the site of the injury, engulf the offending material, and secrete pro-inflammatory factors to promote more cells to proliferate and do the same.
4. Oligodendrocyte. Their main functions are to provide support and insulation to axons in the central nervous system of some vertebrates, equivalent to the function performed by Schwann cells in the peripheral nervous system.
5. Contains much more myelin. White matter is named for its relatively light appearance resulting from the lipid content of myelin.
6. epineurium. The epineurium is the outermost layer of dense irregular connective tissue surrounding a peripheral nerve.