Neuroglia cells differ from neurons in having

Unipolar neurons with an axon and no dendrite are present in

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 : ..........

The fatty layer surrounding a nerve fiber is known as:

The afferent process of a neuron is known as:

Nissl's granules are absent in