Adrenergic nerve fibers and receptors are existing in the cavernous trabeculae, and they surround the deep penile arteries. Noradrenaline is the key neurotransmitter that controls penile flaccidity and tumescence. [13, 14] Sympathetic contraction is considered mediated by activation of postsynaptic alpha(1)-adrenergic receptors that improve intracellular calcium concentrations and imp... https://protesthetic-toys.com/