The bulbous structure present at the terminal end of an axon is ________.
A. Synaptic vesicle store various neurotransmitters that are released at the synapse.
B. Synaptic knob are the bulbous structures present at the terminal end of an axon.
C. Dendrites, also called dendrons, are branched protoplasmic extensions of a nerve cell that propagate the electrochemical stimulation received from other neural cells to the cell body, or soma, of the neuron from which the dendrites project.
D. Schwann cells, also called neurilemma cells are any of the cells in the peripheral nervous system that produce the myelin sheath around neuronal axons.
So, the correct option is 'B'.