Carotid Artery: From 2 Different Sources
Any of the main arteries of the neck and head. There are 2 common carotid arteries (left and right), each of which divides into 2 main branches (internal and external).
The left carotid arises from the aorta and runs up the neck on the left side of the trachea (windpipe). The right carotid arises from the subclavian artery (which branches off the aorta) and follows a similar route on the right side of the
neck. Just above the level of the larynx (voice-box), each carotid artery divides to form an external carotid artery and an internal carotid artery. The external arteries have multiple branches that supply most tissues in the face, scalp, mouth, and jaws; the internal arteries enter the skull to supply the brain and eyes. At the base of the brain, branches of the 2 internal carotids and the basilar artery join to form a ring of vessels called the circle of Willis. Narrowing of these vessels may be associated with transient ischaemic attack (TIA); obstruction of them causes a stroke. carpal tunnel syndrome Numbness, tingling, and pain in the thumb, index finger, and middle fingers caused by compression of the median nerve at the wrist. Symptoms may be worse at night. The condition results from pressure on the nerve where it passes into the hand via a gap (the “carpal tunnel’’) under a ligament at the front of the wrist. It is common among keyboard users. It also occurs without obvious cause in middleaged women, and is associated with pregnancy, initial use of oral contraceptives, premenstrual syndrome, rheumatoid arthritis, myxoedema, and acromegaly.
The condition often disappears without treatment.
Persistent symptoms may be treated with a corticosteroid drug injected under the ligament, or the ligament may be cut to relieve pressure on the nerve.
either of the two main arteries in the neck whose branches supply the head and neck. The common carotid artery arises on the left side directly from the aortic arch and on the right from the innominate artery. They ascend the neck on either side as far as the thyroid cartilage (Adam’s apple), where they each divide into two branches, the internal carotid, supplying the cerebrum, forehead, nose, eye, and middle ear, and the external carotid, sending branches to the face, scalp, and neck.
A small reddish-brown structure measuring 5–7 × 2·5–4 millimetres, situated one on each side of the neck, where the carotid artery divides into the internal and external carotid arteries. Its main function is in controlling breathing so that an adequate supply of oxygen is maintained to the tissues of the body. Oxygen levels are controlled by a re?ex operating between the carotid body and the respiratory centre in the brain.... carotid body
This artery arises from the brachial artery at the level of the neck of the radius. It passes down the forearm to the wrist, where it is easily palpated laterally. It then winds around the wrist to the palm of the hand to supply the ?ngers. (See ARTERIES.)... radial artery
A branch of the external carotid artery that is the main vessel supplying blood to the temple and scalp.... temporal artery
The artery that runs down the inner side of the upper arm, between the armpit and the elbow.... brachial artery
A major blood vessel that supplies oxygenated blood to the leg. The femoral artery is formed in the pelvis from the iliac artery (the terminal branch of the aorta). It then runs from the groin, down in front of the thigh, and passes behind the knee to become the popliteal artery, which branches again to supply the lower leg.... femoral artery
Blockage of an artery supplying blood to the retina, most commonly due to thrombosis or embolism, The disorder can result in permanent blindness or loss of part of the field of vision, depending on the artery affected and whether or not the condition can be treated quickly enough.... retinal artery occlusion
When coronary arteries, narrowed by disease, cannot supply the heart muscle with su?cient blood, the cardiac circulation may be improved by grafting a section of vein from the leg to bypass the obstruction. Around 10,000 people in the United Kingdom have this operation annually and the results are usually good. It is a major procedure that lasts several hours and requires the heart to be stopped temporarily, with blood circulation and oxygenation taken over by a HEART-LUNG MACHINE.... coronary artery vein bypass grafting (cavbg)
A narrowed or blocked coronary artery (see ARTERIES) can compromise the blood supply to the heart muscle (see HEART, DISEASES OF). A supportive tube or stent passed into each affected artery can restore the blood supply. The stent has a HEPARIN coating to stop blood clots from forming. Since it was ?rst performed in 1987, intracoronary stents have cut the reblockage rate from one in three patients who have had coronary ANGIOPLASTY to fewer than one in ten in cases where a stent was used with angioplasty.... intracoronary artery stenting
an artery in the base of the brain, formed by the union of the two vertebral arteries. It extends from the lower to the upper border of the pons Varolii and then divides to form the two posterior cerebral arteries.... basilar artery
see innominate artery.... brachiocephalic artery
(carotid stenosis) narrowing of the carotid artery, which reduces the supply of blood to the brain and is a cause of strokes. It is treated by surgical excision or bypass of the narrowed segment (see also endarterectomy) or by inserting a *stent into the carotid artery.... carotid artery stenosis
a pocket in the wall of the carotid artery, at its division in the neck, containing receptors that monitor blood pressure (see baroreceptor). When blood pressure is raised, impulses travel from the receptors to the vasomotor centre in the brain, which initiates a reflex *vasodilatation and slowing of heart rate to lower the blood pressure to normal.... carotid sinus
(CABG) *coronary revascularization in which a segment of a coronary artery narrowed by atheroma is bypassed by an *autologous section of healthy saphenous vein or internal mammary artery at *thoracotomy. The improved blood flow resulting from one or more such grafts relieves *angina pectoris and reduces the risk of *myocardial infarction. Recently developed techniques of *minimally invasive surgery have enabled the operation to be performed without the need for thoracotomy.... coronary artery bypass graft
the terminal branch of an artery, which does not communicate with other branches. The tissue it supplies is therefore probably completely dependent on it for its blood supply.... end artery
a fetal artery lying in the *hyaloid canal of the eye and supplying the lens.... hyaloid artery
(brachiocephalic artery) a short artery originating as the first large branch of the *aortic arch, passing upwards to the right, and ending at the lower neck near the right sternoclavicular joint. Here it divides into the right common carotid and the right subclavian arteries.... innominate artery
the artery that conveys blood from the heart to the lungs for oxygenation: the only artery in the body containing deoxygenated blood. It leaves the right ventricle and passes upwards for 5 cm before dividing into two, one branch going to each lung. Within the lungs each pulmonary artery divides into many fine branches, which end in capillaries in the alveolar walls. See also pulmonary circulation.... pulmonary artery
either of two large arteries arising from the abdominal aorta and supplying the kidneys. Each renal artery divides into an anterior and a posterior branch before entering the kidney.... renal artery
either of two arteries that originate from the abdominal aorta and travel downwards to supply the testes.... spermatic artery
(SPA) a surgical procedure to identify and occlude the sphenopalatine artery in the nose using endoscopic surgery. It is used in the treatment of severe epistaxis (nosebleed).... sphenopalatine artery ligation
either of two arteries supplying blood to the neck and arms. The right subclavian artery branches from the innominate artery; the left subclavian arises directly from the aortic arch.... subclavian artery
a branch of the brachial artery arising at the elbow and running deep within the muscles of the medial side of the forearm. It passes into the palm of the hand, where it unites with the arch of the radial artery and gives off branches to the hand and fingers.... ulnar artery
a method of embolizing the uterine artery under radiodiagnostic control (see embolization). It has been successful in controlling postpartum haemorrhage and can also be used in treating fibroids, correcting arterial or venous malformations of the genital tract, and terminating abdominal and cervical pregnancies.... uterine artery embolization
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