| RFA | resident functional atlas; right femoral artery; right frontoanterior [fetal position] |
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| RSA | rabbit serum albumin; regular spiking activity; relative specific activity; relative standard accura... |
| RVA | re-entrant ventricular arrhythmia; right ventricle activation; right vertebral artery |
| RLL | right lobe of liver; right lower limb; right lower lobe |
| DILD | diffuse infiltrative lung disease; diffuse interstitial lung disease |
| ascending degeneration | Retrograde degeneration of an injured nerve fibre; i.e., toward the nerve cell of the fibre, degeneration cephalad to a spinal cord lesion. (05 Mar 2000) |
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| ascending frontal convolution | Bounded posteriorly by the central sulcus and anteriorly by the precentral sulcus. Synonym: gyrus precentralis, anterior central convolution, anterior central gyrus, ascending frontal convolution, ascending frontal gyrus. (05 Mar 2000) |
| ascending frontal gyrus | Bounded posteriorly by the central sulcus and anteriorly by the precentral sulcus. Synonym: gyrus precentralis, anterior central convolution, anterior central gyrus, ascending frontal convolution, ascending frontal gyrus. (05 Mar 2000) |
| ascending lumbar vein | <anatomy, vein> Paired, vertical vein of the posterior abdominal wall, adjacent and parallel to the vertebral column, posterior to the origin of the psoas major muscle; it connects the common iliac, iliolumbar, and lumbar veins in the paravertebral line, the right vein joining the right subcostal vein to form the azygos vein, the left vein uniting with the left subcostal vein to form the hemiazygos vein. Synonym: vena lumbalis ascendens. (05 Mar 2000) |
| ascending myelitis | Progressive inflammation involving successively higher areas of the spinal cord. (05 Mar 2000) |
| ascending neuritis | Inflammation progressing upward along a nerve trunk in a direction away from the periphery. (05 Mar 2000) |
| ascending paralysis | A paralysis of rapid course beginning in the legs and involving progressively the trunk, arms, and neck, ending sometimes in death in from one to three weeks. Synonym: ascending paralysis. (05 Mar 2000) |
| ascending parietal convolution | The anterior convolution of the parietal lobe, bounded in front by the central sulcus (fissure of Rolando) and posteriorly by the interparietal sulcus. Synonym: gyrus postcentralis, ascending parietal convolution, ascending parietal gyrus, posterior central convolution, posterior central gyrus. (05 Mar 2000) |
| ascending parietal gyrus | The anterior convolution of the parietal lobe, bounded in front by the central sulcus (fissure of Rolando) and posteriorly by the interparietal sulcus. Synonym: gyrus postcentralis, ascending parietal convolution, ascending parietal gyrus, posterior central convolution, posterior central gyrus. (05 Mar 2000) |
| ascending part of aorta | The part of the aorta prior to the aortic arch from which arise the coronary arteries. Synonym: aorta ascendens, ascending part of aorta, pars ascendens aortae. (05 Mar 2000) |
| ascending part of duodenum | The terminal or fourth part of the duodenum, ascending from the horizontal part to the jejunum. Synonym: pars ascendens duodeni. (05 Mar 2000) |
| ascending pharyngeal plexus | An autonomic plexus on the artery of the same name, formed of fibres from the superior cervical ganglion. Synonym: plexus pharyngeus ascendens. (05 Mar 2000) |
| ascending process | An upward extension of the embryonic pterygoquadrate cartilage; it develops into the greater wing of the sphenoid bone. Synonym: ascending process. (05 Mar 2000) |
| ascending pyelonephritis | Pyelonephritis due to bacterial infection from the lower urinary tract, particularly by reflux of infected urine. (05 Mar 2000) |
| ascending tick paralysis | <neurology> An ascending paralysis caused by the continued presence of Dermacentor and Ixodes ticks attached to the occipital or upper neck region in humans. The treatment consists of tick removal and supportive care. (27 Sep 1997) |