Where are $Nissl$ granules found?

The myelin sheath is continuous. If the myelin sheath were continuous in a myelinated nerve fiber,what would happen to nerve conduction?

Neuroglia cells differ from neurons in having

Which of the following is the immediate covering of a nerve fibre?

Analogy type question:
$(1)$ Myelinated nerve fiber is covered by Schwann cells : The gap between two adjacent myelin sheaths : .......
$(2)$ Multipolar neuron : One axon and two or more dendrites :: Bipolar neuron : ..........

Afferent nerve fibers transmit impulses from: