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Microvasculature comprises the microvessels – venules and capillaries of the microcirculation, with a maximum average diameter of 0.3 millimeters. [1] As the vessels decrease in size, they increase their surface-area-to-volume ratio. This allows surface properties to play a significant role in the function of the vessel.
These endfeet are able to produce prostaglandin E2 (PGE2), a potent vasodilator, and 20-hydroxyeicosatetraenoic acid (20-HETE), a vasoconstrictor, both of which exert their effects on vascular smooth muscle cells in arterioles and pericytes in capillaries, leading to the vasodilation and vasoconstriction respectively.
Cerebral circulation is the movement of blood through a network of cerebral arteries and veins supplying the brain. The rate of cerebral blood flow in an adult human is typically 750 milliliters per minute, or about 15% of cardiac output. Arteries deliver oxygenated blood, glucose and other nutrients to the brain.
In a morphological study, area postrema capillaries in the ventral subregion of area postrema were shown to be relatively impermeable like those of the brain, whereas medial and dorsal area postrema capillaries had microscopic characteristics of high permeability, a characteristic called sinusoidal. [6] Subregional capillary density of the area ...
Anatomical terminology. [edit on Wikidata] The dural venous sinuses (also called dural sinuses, cerebral sinuses, or cranial sinuses) are venous sinuses (channels) found between the endosteal and meningeal layers of dura mater in the brain. [1][2] They receive blood from the cerebral veins, and cerebrospinal fluid (CSF) from the subarachnoid ...
A capillary is a small blood vessel, from 5 to 10 micrometres in diameter, and is part of the microcirculation system. Capillaries are microvessels and the smallest blood vessels in the body. They are composed of only the tunica intima (the innermost layer of an artery or vein), consisting of a thin wall of simple squamous endothelial cells. [2]
Circumventricular organs (CVOs) (circum-: around ; ventricular: of ventricle) are structures in the brain characterized by their extensive and highly permeable capillaries, unlike those in the rest of the brain where there exists a blood–brain barrier (BBB) at the capillary level. [1][2][3][4] Although the term "circumventricular organs" was ...
63174. Anatomical terms of microanatomy. [edit on Wikidata] Pericytes (formerly called Rouget cells) [1] are multi-functional mural cells of the microcirculation that wrap around the endothelial cells that line the capillaries throughout the body. [2] Pericytes are embedded in the basement membrane of blood capillaries, where they communicate ...