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.
Dual Innervation. There are two branches or divisions of the autonomic nervous system (ANS): the sympathetic and parasympathetic. Both branches innervate most organs in an arrangement called dual innervation. The parasympathetic division is most active during rest and stimulates digestive activities.