Medicine/Medical. puncture into the arachnoid membrane of the spinal cord, in the lumbar region, and withdrawal of spinal fluid, performed for diagnosis of the fluid, injection of dye for imaging, or administration of anesthesia or medication.
(med) insertion of a hollow needle into the lower region of the spinal cord to withdraw cerebrospinal fluid, introduce drugs, etc
lumbar puncture n.
Puncture into the subarachnoid space of the lumbar region for diagnostic or therapeutic purposes. Also called rachicentesis, rachiocentesis, spinal puncture, spinal tap.
The insertion of a hollow needle beneath the arachnoid membrane of the spinal cord in the lumbar region to withdraw cerebrospinal fluid for diagnostic purposes or to administer medication.
- Lumbar quadrate muscle
lumbar quadrate muscle n. A muscle with origin from the iliac crest, the iliolumbar ligament, and the lower lumbar vertebrae, with insertion into the twelfth rib and the upper lumbar vertebrae, with nerve supply from the upper lumbar nerve, and whose action abducts the trunk. Also called quadrate muscle of loins.
- Lumbar rheumatism
lumbar rheumatism n. See lumbago.
- Lumbar rib
lumbar rib n. A rib articulating with the transverse process of the first lumbar vertebra; occurring only occasionally.
- Lumbar splanchnic nerve
lumbar splanchnic nerve n. Any of the branches from the lumbar sympathetic trunks that pass anteriorly to join the celiac, intermesenteric, aortic, and superior hypogastric plexuses.