| NI-NXII | first to twelfth cranial nerves |
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| N&M | nerves and muslces; night and morning |
| nn | nerves; new name [Lat. nomen novum] |
| Ns | nasospinale; nerves |
| 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) |
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| 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) |
| sacral cornua | The most caudal parts of the intermediate sacral crest. On each side they form the lateral margin of the sacral hiatus and articulate with the coccygeal cornua. Synonym: cornua sacralia, sacral horns. (05 Mar 2000) |
| sacral crest | One of three rough irregular ridges on the posterior surface of the sacrum; median sacral crest; lateral sacral crests. Synonym: crista sacralis. (05 Mar 2000) |
| sacral flexure | The bend in the lumbosacral region of the embryo. Synonym: sacral flexure. (05 Mar 2000) |
| sacral flexure of rectum | The anteroposterior curve with concavity anteriorward of the first portion of the rectum. Synonym: flexura sacralis recti. (05 Mar 2000) |
| sacral foramen | One of the openings between the fused sacral vertebrae transmitting the sacral nerves. The anterior sacral foramina transmit ventral primary rami of the sacral nerves. The posterior sacral foramina give passage to dorsal primary rami of the sacral nerves. Synonym: foramen sacrale. (05 Mar 2000) |
| sacral ganglia | Three or four ganglia on either side constituting, with the ganglion impar and the interganglionic rami, the pelvic portion of the sympathetic trunk. Synonym: ganglia sacralia. (05 Mar 2000) |
| sacral hiatus | A normally-occurring gap at the lower end of the sacrum, exposing the vertebral canal, due to failure of the laminae of the last sacral segment to coalesce. It is closed by the sacrococcygeal ligament, and provides cannular access to the sacral epidural space for administration of anaesthetics (caudal nerve blocks). Synonym: hiatus sacralis. (05 Mar 2000) |
| sacral horns | The most caudal parts of the intermediate sacral crest. On each side they form the lateral margin of the sacral hiatus and articulate with the coccygeal cornua. Synonym: cornua sacralia, sacral horns. (05 Mar 2000) |
| sacral index | A ratio obtained by multiplying the greatest breadth of the sacrum by 100 and dividing by the length. (05 Mar 2000) |