ANAT 3010 Lecture Notes - Lecture 11: Vasa Vasorum, Tunica Externa, Tunica Intima
21 Feb 2020
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Anat 3010 lecture 11 february 3, 2020 the cardiovascular system i (blood vessels) Types of blood vessels: 3 major types of blood vessels, arteries - carry blood away from the heart, capillaries - the smallest blood vessels, veins - receive blood from venules and bring it back to the heart. Arteries begin in the heart and ends in the capillaries and the veins begin in the capillaries but ends in the heart. The inner most layer is the tunica intima, followed by the tunica media and the outermost is the tunica externa. In the capillary network, there are simple squamous epithelium, which has a special name, called endothelium (means lining of the blood vessels). The tunica media contains two types of fibers, smooth muscles and elastic fibers, which can contact and make the vessels narrower (vasoconstriction) or relax to cause dilation. The vasa vasorum: vasa and vasorum both mean blood vessels.
