Belwo: two schemas of the blood vessels innervation
Thursday, October 8, 2015
The innervation of blood vessels, specially arteries and arterioles, is effectuated by sympathetic, postglanglionic, efferent fibers as well as by preganglionic efferent fibers from the ganglia that make up the sympathetic ganglionic chain and from the spinal cord nerve roots, respectively. The sympathetic postganglionic fibers are called grey rami communicantes, while the preganglionic fibers are the white rami communicantes. These sympathetic adrenergic fibers constrict the blood vessel wall smooth muscle. However, peripheral subcutaneous and skin blood vessels are innervated by both sympathetic and parasympathetic fibers.