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Transmural pressure is the difference in pressure between two sides of a wall or equivalent separator. According to myogenic theory smooth muscle contract in response to increased transmural pressure and relax to decreased transmural pressure For body vasculature or other hollow organs, see Smooth muscle#External substances
Arterial compliance is an important cardiovascular risk factor. Compliance diminishes with age and menopause. Arterial compliance is measured by ultrasound as a pressure (carotid artery) and volume (outflow into aorta) relationship. [5] Compliance, in simple terms, is the degree to which a container experiences pressure or force without disruption.
The superficial temporal vein is a vein of the side of the head which collects venous blood from the region of the temple. [ 1 ] : 355 It arises from an anastomosing venous plexus on the side and top of the head.
The cavernous sinus is one of the dural venous sinuses of the head. It is a network of veins that sit in a cavity.It sits on both sides of the sphenoidal bone and pituitary gland, approximately 1 × 2 cm in size in an adult. [2]
The diploic veins drain this area into the dural venous sinuses. The four major trunks of the diploic veins found on each side of the head are frontal, anterior temporal, posterior temporal, and occipital diploic veins. [2] [3] They tend to be symmetrical, with the same pattern of large veins on each side of the skull. [1]
There are usually three lacunae on either side of the sinus: a small frontal, a large parietal, and an occipital, intermediate in size between the other two. [ citation needed ] Most of the cerebral veins from the outer surface of the hemisphere open into these lacunæ, and numerous arachnoid granulations (Pacchionian bodies) project into them ...
The posterior auricular vein begins upon the side of the head, in a plexus which communicates with the tributaries of the occipital vein and the superficial temporal vein. It descends behind the auricle. [1] It joins the posterior division of the retromandibular vein. [1] It drains into the external jugular vein. [1] [2]
The veins converge to form a single trunk, which runs downward near the middle line of the forehead parallel with the vein of the opposite side. The two veins are joined, at the root of the nose, by a transverse branch, called the nasal arch , which receives some small veins from the dorsum of the nose.