the disk in the fundus of the eye marking the point at which the optic nerve enters; it is accompanied by blood vessels, is oval, light in color and the blind spot of the retina.
ARTERIOLES. In arterioles, the tunica intima consists of a continuous endothelium and a very thin subendothelial layer. In addition, a thin, fenestrated internal elastic lamina is present in larger arterioles but absent in terminal arterioles. Generally, the tunica media consists of 2 layers of smooth muscle cells.
3. Arterioles: smallest artery, narrow down to single layer of smooth muscle. Controls blood flow into capillaries through response to neural and chemical influence. Constriction of arterioles bypasses tissues served, dilation floods tissues served.. Arterioles: smallest artery, narrow down to single layer of smooth muscle. Controls blood flow into capillaries through response to neural and chemical influence. Constriction of arterioles bypasses tissues served, dilation floods tissues served.