A vessel of the microcirculature, lying between the arterioles and venules; includes capillaries (blood and lymphatic), metarterioles and arteriovenous anastomoses.
peristaltic circulatory vessel
portal system +
pulmonary venous system +
rete mirabile
systemic venous system +
tail vasculature +
vascular plexus +
vasculature of central nervous system plus retina +