| interauricular arc | A line carried over the cranium from the centre of one external auditory meatus to that of the other. Synonym: interauricular arc. (05 Mar 2000) |
|---|---|
| tungsten arc lamp | <apparatus> A lamp having highly compressed tungsten elements. (05 Mar 2000) |
| unipolar arc | <radiobiology> Arc between a metal surface and a plasma in contact with it. Such an arc requires only one electrode and is maintained by the thermal energy of the electrons. (09 Oct 1997) |
| flame arc | An arc between two impregnated electrodes that causes volatilization of the core with resultant flame. (05 Mar 2000) |
| longitudinal arc of skull | The line carried over the skull in the midline from the nasion to the opisthion. (05 Mar 2000) |
| ventral primary rami of sacral spinal nerves | See: ventral primary ramus of spinal nerve. Synonym: rami ventrales nervorum sacralium. (05 Mar 2000) |
| median sacral artery | <anatomy, artery> Origin, posterior aspect of abdominal aorta just above the bifurcation; distribution, lower lumbar vertebrae, sacrum, and coccyx; anastomoses, lateral sacral, superior and middle rectal. Synonym: arteria sacralis mediana, middle sacral artery. (05 Mar 2000) |
| median sacral crest | An unpaired crest formed by the fused spinous processes of the upper four sacral vertebrae. Synonym: crista sacralis mediana. (05 Mar 2000) |
| median sacral vein | <anatomy, vein> An unpaired vein accompanying the middle sacral artery receiving blood from the sacral venous plexus and emptying into the left common iliac vein. Synonym: vena sacralis mediana. (05 Mar 2000) |
| middle sacral artery | <anatomy, artery> Origin, posterior aspect of abdominal aorta just above the bifurcation; distribution, lower lumbar vertebrae, sacrum, and coccyx; anastomoses, lateral sacral, superior and middle rectal. Synonym: arteria sacralis mediana, middle sacral artery. (05 Mar 2000) |
| middle sacral plexus | A lymphatic plexus formed of lymph nodes and connecting vessels situated chiefly in the mesorectum anterior and inferior to the sacral promontory. Synonym: plexus sacralis medius. (05 Mar 2000) |
| sacral | <anatomy> Of or pertaining to the sacrum; in the region of the sacrum. Source: Websters Dictionary (01 Mar 1998) |
| sacral agenesis | <radiology> Agenesis or hypoplasia of sacrum, part of caudal-regression syndrome, associated with maternal diabetes, with or without inherited, possible features: absent lower extremities, bladder/bowel impairment (12 Dec 1998) |
| sacral anaesthesia | Regional anaesthesia limited to those areas innervated by sacral sensory nerves. (05 Mar 2000) |
| sacral canal | The continuation of the vertebral canal in the sacrum. Synonym: canalis sacralis. (05 Mar 2000) |