A spinal anomaly in which the first and second segments of the sacrum do not fuse, and consequently the lumbar spine appears to have six vertebrae or segments, not five, while the sacrum appears to have only four.

plural of lumbarization

Related to the lower back or loin, specifically the five vertebrae between the rib cage and the pelvis.

(informal) The lumbar region. / A lumbar vertebra.

plural of lumbar

(anatomy) Any of the five vertebrae in the loin or lower back region of the spine.

plural of lumbar puncture

(medicine) A diagnostic and at times therapeutic procedure performed to collect a sample of cerebrospinal fluid for biochemical, microbiological, and cytological analysis, or rarely to relieve increased intracranial pressure.

plural of lumbar vertebra

(neuroanatomy) Any of the small ganglia of the lumbar part of the sympathetic nervous system.