The principle component of Nissl bodies which contribution to their basophilic s

Question

The principle component of Nissl bodies which contribution to their basophilic staining is a. protein b. DNA c. RNA d. protoglysen e. none of the above Which of the following functions is associated with astrocytes? a. myelination of central neurons b. myelination of peripheral neurons c. communication between central neurons and blood vessels d. communication between peripheral neurons and blood vessels e. none of the above Cerebrospinal fluid is produced at regions where which of the following interact? a. pia and astrocytes b. pia and oligodendrocytes c. pia and ependyma d. dura and ependyma e. arachnoid and ependyma Which of the following properties is/are shared by oligodendrocytes and Schwann cells? a. both are derived from neural crest b. both myelinate only one axon at a time c. both are found in peripheral nerves d. all of the above e. none of the above Which of the following effects on impulse conduction along axons resets from a. a smooth, continuous wave of voltage reversal b. a slower rate of impulse conduction c. facilitation of ion flow across all membrane regions d. all of the above e none of the above Histological examination of nerve tissues with silver stains would be used to best a. cell bodies of neurons and glia b. nuclei of neurons and glia

Explanation / Answer

17. E. Both can receive synaptic input.

Dendrites receive input while as axon transmits output signals.

18. C. RNA.

Nissl bodies can be demonstrated by a method of selective staining called Nissl staining to label extranuclear RNA granules. Due to RNA's basophilic ("base-loving") properties it is stained blue by this method.

19. E. None of these.

20. E. Archanoid and ependyma.

CSF is produced in the choroid plexuses of the ventricles of the brain.The choroid plexus consists of modified ependymal cells. The CSF occupies the subarachnoid space (between the arachnoid mater and the pia mater)

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