| NAR | nasal airway resistance; National Association for Retarded [Children, Citizens]; no action required |
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| NAS | nasal; National Academy of Sciences; National Association of Sanitarians; neonatal airleak syndrome;... |
| N-CPAP, | n-CPAP nasal continuous positive airway pressure |
| ND | Doctor of Naturopathy; nasal deformity; natural death; Naval Dispensary; neonatal death; neoplastic ... |
| NSR | nasal septal reconstruction; nonspecific reaction; normal sinus rhythm; no sign of recurrence; not s... |
| common carotid artery | <anatomy, artery> Origin, right from brachiocephalic, left from arch of aorta; runs upward in the neck and divides opposite upper border of thyroid cartilage (C-4 vertebral level) into terminal branches, external and internal carotid. Synonym: arteria carotis communis. (05 Mar 2000) |
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| common carotid plexus | An autonomic plexus accompanying the artery of the same name formed by fibres from the middle cervical ganglion. Synonym: plexus caroticus communis. (05 Mar 2000) |
| common cold | A viral upper respiratory tract infection. A contagious illness caused by a number of different types of viruses. Because of the great number of viruses that can cause a cold, the body never builds up resistance (immune) against all of them. For this reason, colds are a frequent and recurring problem. In fact, preschool children average 9 colds a year; those in kindergarten, 12 colds a year; and adolescents and adults, 7 colds per year. Going out into the cold weather has no effect on the spread of a cold. Antibiotics do not help the common cold. (12 Dec 1998) |
| common cold virus | Any of the numerous strains of virus aetiologically associated with the common cold, chiefly the rhinoviruses, but also strains of adenovirus, Coxsackievirus, ECHO virus, and parainfluenza virus. Synonym: cold virus. (05 Mar 2000) |
| common crus of saemicircular ducts | The united, nonampullary ends of the superior and posterior saemicircular ducts. Synonym: crus membranaceum commune ductus saemicircularis, common limb of membranous saemicircular ducts. (05 Mar 2000) |
| common duct | <anatomy> This is the main bile duct, which is formed as the right and left hepatic bile ducts join, this common duct empties bile into the duodenum. (09 Oct 1997) |
| common facial vein | <anatomy, vein> A short vessel formed by the union of the facial vein and the retromandibular vein, emptying into the jugular vein; considered to be a continuation of the facial vein in the NA. Synonym: vena facialis communis. (05 Mar 2000) |
| common fibular nerve | <anatomy, nerve> One of the terminal divisions of the sciatic nerve, diverging from the tibial nerve at the upper end of the popliteal fossa, then coursing with the biceps tendon along the lateral portion of the popliteal space to wind around the neck of the fibula where it divides into the superficial and deep peroneal nerves. The common peroneal nerve, or its deep branch, is the most commonly injured nerve, being located in a lateral subcutaneous position at the fibular neck; a lesion causes a loss of ability to dorsiflex the foot ("foot drop"). Synonym: nervus fibularis communis, nervus peroneus communis, common fibular nerve, lateral popliteal nerve. (05 Mar 2000) |
| common flexor sheath | The synovial sheath that surrounds the eight tendons of the superficial and deep flexors of the digits of the hand as they pass through the carpal canal; it is commonly continuous with the digital sheath of the little finger. Synonym: vagina communis musculorum flexorum, ulnar bursa. (05 Mar 2000) |
| common hepatic artery | <anatomy, artery> Origin, coeliac; branches, right gastric, gastroduodenal, and proper hepatic. Synonym: arteria hepatica communis. (05 Mar 2000) |
| common hepatic duct | The part of the biliary duct system that is formed by the confluence of right and left hepatic ducts. at the porta hepatis it is joined by the cystic duct to become the common bile duct. Synonym: ductus hepaticus communis, hepatocystic duct. (05 Mar 2000) |
| common iliac artery | <anatomy, artery> One of the two terminal branches of the abdominal aorta; opposite the lumbosacral joint, it bifurcates to form the internal iliac and the external iliac. Synonym: arteria iliaca communis. (05 Mar 2000) |
| common iliac lymph nodes | Nodes located in association with the common iliac vein; they are subdivided into five groups: intermediate (anterior) common iliac lymph nodes, between the common iliac artery and vein; lateral common iliac lymph nodes lateral to the vein; medial common iliac lymph nodes, medial to the vein; promontory common iliac lymph nodes at the sacral promontory; and subaortic common iliac lymph nodes, at the bifurcation of the aorta; they all receive afferent vessels from the external and internal iliac nodes and send efferent vessels to the lumbar nodes. Synonym: nodi lymphatici iliaci communes. (05 Mar 2000) |
| common iliac vein | <anatomy, vein> Formed by the union of the external and internal iliac veins at the brim of the pelvis and passes upward behind the internal iliac artery to the right side of the body of the fifth lumbar vertebra where it unites with its fellow of the opposite side to form the inferior vena cava; the left common iliac vein is submitted to a pulsating compression by the right common iliac artery against the vertebral column which may result in partial obstruction of the vein. Synonym: vena iliaca communis. (05 Mar 2000) |
| common intermediate | <biochemistry, chemistry> A molecule that is shared by two chemical reactions as a product of the first and a reactant in the second. (09 Oct 1997) |