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Dural venous sinuses bordered by hard meninges (shown in blue) direct blood outflow from cerebral veins to the internal jugular vein at the base of skull. Cerebral blood flow (CBF) is the blood supply to the brain in a given period of time. [8] In an adult, CBF is typically 750 millilitres per minute or 15.8 ± 5.7% of the cardiac output. [9]
An injured middle meningeal artery is the most common cause of an epidural hematoma. A head injury (e.g., from a road traffic accident or sports injury) is required to rupture the artery. Emergency treatment requires decompression of the hematoma, usually by craniotomy. Subdural bleeding is usually venous in nature, rather than arterial ...
An epidural hematoma is a collection of blood between the dura and the inner surface of the skull, and is usually due to arterial bleeding. Intradural procedures, such as removal of a brain tumour or treatment of trigeminal neuralgia via a microvascular decompression , require that an incision is made to the dura mater.
This compensatory effect is however usually inadequate to maintain a normal blood supply. [11] Therapies that attempt to optimize leptomeningeal collateral circulation appear to improve outcomes following acute ischaemic stroke. [2] MRI and CT brain imaging is used to determine the severity of a stroke, and help guide treatment. Fluid ...
Interference with the blood supply can cause dangerous increases in ICP that can lead to more dangerous forms of herniation. [14] Symptoms for cingulate herniation are not well defined. [14] Usually occurring in addition to uncal herniation, cingulate herniation may present with abnormal posturing and coma. [7]
The circle of Willis (also called Willis' circle, loop of Willis, cerebral arterial circle, and Willis polygon) is a circulatory anastomosis that supplies blood to the brain and surrounding structures in reptiles, birds and mammals, including humans. [1] It is named after Thomas Willis (1621–1675), an English physician. [2]
The danger triangle of the face consists of the area from the corners of the mouth to the bridge of the nose, including the nose and maxilla. [1] [2]: 345–346 Due to the special nature of the blood supply to the human nose and surrounding area, it is possible for retrograde infection from the nasal area to spread to the brain, causing cavernous sinus thrombosis, meningitis, or brain abscess.
Very low blood pressure may occur at an early stage, especially but not exclusively in meningococcal meningitis; this may lead to insufficient blood supply to other organs. [2] Disseminated intravascular coagulation, the excessive activation of blood clotting, may obstruct blood flow to organs and paradoxically increase the bleeding risk.