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.
Neurons from the sympathetic division of the ANS extend from the spinal cord to form nerves that meet at several autonomic ganglia in the abdomen. Each autonomic ganglion, such as the celiac ganglion, forms a plexus of nerve fibers that extend to the organs of the abdomen and pelvis to control their function. The parasympathetic division of the ANS is also represented in the abdomen and pelvis through the vagus nerve and the sacral nerves. The vagus nerve is a cranial nerve that wanders from the base of the brain parallel to the spinal cord to stimulate digestion in the liver, stomach, and intestines.