More early signs of pregnancy include an aching head, a result of changes in hormones. Just in case you are indeed pregnant, take pg-safe acetaminophen instead of ibuprofen to deal with the pain.
Organs Without Dual Innervation. Although most organs are innervated by both sympathetic and parasympathetic nerves, some-including the adrenal medulla, arrector pili muscles, sweat glands, and most blood vessels-receive only sympathetic innervation.
There are two divisions in the autonomic nervous system; i.e. sympathetic nervous system and parasympathetic nervous system. Both systems usually act on the same organ and generate the same action potentials, yet their functions are different and oppose each other. Sympathetic Nervous System. Sympathetic nervous system is the nerve network made up of short preganglionic axons that extend to ganglia situated near thoracic and lumbar regions of spinal cord, and of long postganglionic neurons extending from ganglia to target organs.