What do the colors on the flag of Norway mean? Credit: Thinkstock Images Stockbyte Getty Images. The Union Jack is composed of the flags of three patron saints layered one over the other. The central red cross on a white field is the flag of St. George, the patron saint of England.
Synaptic vesicles contain thousands of neurotransmitter. The  neurotransmitters are packed into a small membrane bound synaptic  vesicles. There are thousands of neurotransm â¦ itter molecules.
Preganglionic axons in the vagus nerve synapse on terminal ganglia located within plexuses inside the visceral organ being innervated. A microscope is required to view terminal ganglia. Sacral parasympathetic preganglionic neurons are located in intermediate gray matter of spinal cord segments (S 1,2,3 in the carnivore). Bilaterally, preganglionic axons run through the lumbosacral plexus and pelvic nerve to synapse on pelvic ganglia within the pelvic plexus.