interspinales lumborum (muscles)

in·ter·spi·na·les lumborum (mus·cles)

[TA] deep muscle of lower back; origin, superior margin of lumbar spinous process; insertion, inferior margin of next superior spinous process; action, extends lumbar vertebrae; nerve supply, dorsal primary rami of lumbar spinal nerves. Synonym(s): musculus interspinalis lumborum [TA], lumbar interspinal muscle