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blood vessel that conveys blood away from the heartheart,
muscular organ that pumps blood to all parts of the body. The rhythmic beating of the heart is a ceaseless activity, lasting from before birth to the end of life. Anatomy and Function

The human heart is a pear-shaped structure about the size of a fist.
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. Except for the pulmonary artery, which carries deoxygenated blood from the heart to the lungs, arteries carry oxygenated blood from the heart to the tissues. The largest arterial trunk is the aortaaorta
, primary artery of the circulatory system in mammals, delivering oxygenated blood to all other arteries except those of the lungs. The human aorta, c.1 in. (2.54 cm) in diameter, originates at the left ventricle of the heart.
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, branches of which divide and subdivide into ever-smaller tubes, or arterioles, until they terminate as minute capillariescapillary
, microscopic blood vessel, smallest unit of the circulatory system. Capillaries form a network of tiny tubes throughout the body, connecting arterioles (smallest arteries) and venules (smallest veins).
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, the latter connecting with the veinsvein,
blood vessel that returns blood to the heart. Except for the pulmonary vein, which carries oxygenated blood from the lungs to the heart, veins carry deoxygenated blood. The oxygen-depleted blood passes from the capillaries to the venules (small veins).
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 (see circulatory systemcirculatory system,
group of organs that transport blood and the substances it carries to and from all parts of the body. The circulatory system can be considered as composed of two parts: the systemic circulation, which serves the body as a whole except for the lungs, and the
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). Other important arteries are the subclavian and brachial arteries of the shoulder and arm, the carotid arteries that lead to the head, the coronary arteries that nourish the heart itself, and the iliac and femoral arteries of the abdomen and lower extremities. The walls of the large arteries have three layers: a tough elastic outer coat, a layer of muscular tissue, and a smooth, thin inner coat. Arterial walls expand and contract with each heartbeat, pumping blood throughout the body. The pulsating movement of blood, or pulsepulse,
alternate expansion and contraction of artery walls as heart action varies blood volume within the arteries. Artery walls are elastic. Hence they become distended by increased blood volume during systole, or contraction of the heart.
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, may be felt where the large arteries lie near the body surface.


A vascular tube that carries blood away from the heart.


any of the tubular thick-walled muscular vessels that convey oxygenated blood from the heart to various parts of the body
References in periodicals archive ?
Middle cerebral artery flow velocity waveforms in normal and small-for-gestational-age fetuses.
The internal diameter measurement of the midpoint of the bilateral A1, A2 segments of the anterior cerebral artery, the azygos artery and the accessory of the anterior cerebral artery (ACAacs) in the case of the triple variant of the ACA was performed.
Lift up the bottom of the temporal to expose the lower part of the middle brain, the lateral upper part of the pons, posterior cerebral artery P2 segment and its branches, oculomotor nerve.
Caption: Figure 2: Magnetic resonance angiography of cerebral vessels showing abrupt cut-off of the left middle cerebral artery (red circle) and narrowing of the left anterior cerebral artery
The cerebral vascularity can be preserved with a high flow interpositional bypass using petrous to supraclinoid ICA bypass, superficial temporal artery to middle cerebral artery bypass, superficial temporal artery to middle cerebral artery bypass with saphenous graft, superficial temporal artery to superior cerebellar artery bypass, long saphenous bypass, in situ bypass or primary reanastomosis.
The cortical branches of the middle cerebral artery are described by the areas they irrigate.
In the pMCAO experiments, STVNA was administered at 0, 2,4, or 6 hours after the middle cerebral artery occlusion (N = 8 per group).
The CT-angiography (CTA) and digital subtraction angiography (DSA) showed multiple cerebral aneurysms at the site of bifurcation of right middle cerebral artery, A1 segment of left anterior cerebral artery, anterior communicating artery, left posterior communicating artery, and basilar artery bifurcation (Figure 1).
The neurovascular stent retrievers are currently the preferred interventional tool used to extract clots lodged in the distal internal carotid artery and proximal middle cerebral artery causing acute stroke within six hours of stroke onset.
Doppler assessment of the peak systolic flow velocity (PSV) of the middle cerebral artery (MCA) is highly reproducible in trained hands and very effective in detecting severe anaemia of all causes.
Cerebral CT angiography demonstrated complete occlusion of the right middle cerebral artery territory [Figure 2a and 2b].

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