| LMP | large multifunctional protease; last menstrual period; latent membrane potential; left mentoposterio... |
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| LP | labile peptide; labile protein; laboratory procedure; lactic peroxidase; lamina propria; laryngophar... |
| LS | lateral suspensor; left sacrum; left septum; left side; legally separated; leiomyosarcoma; length of... |
| LS-BMD | lumbar spine bone mineral density |
| LSI | large-scale integration; life satisfaction index; lumbar spine index |
| lumbar triangle | An area in the posterior abdominal wall bounded by the edges of the latissimus dorsi and external oblique muscles and the iliac crest; herniations occasionally occur here. Synonym: trigonum lumbale, Petit's lumbar triangle. (05 Mar 2000) |
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| lumbar trunks | Two lymphatic ducts conveying lymph from the lower limbs, pelvic viscera and walls, large intestine, kidneys, and suprarenal glands; they discharge into the cisterna chyli. Synonym: trunci lumbales. (05 Mar 2000) |
| lumbar veins | Five in number, these veins accompany the lumbar arteries, drain the posterior body wall and the lumbar vertebral venous plexuses, and terminate anteriorly as follows: the first and second in the ascending lumbar vein, the third and fourth in the inferior vena cava, and the fifth in the iliolumbar vein; all communicate via the ascending lumbar veins. Synonym: venae lumbales. (05 Mar 2000) |
| lumbar vertebrae | The vertebrae, usually five in number, located in the lumbar region of the back. Synonym: vertebrae lumbales. (05 Mar 2000) |