Medial Lumbar Intertransversarius (Left) (Musculus intertransversarius medialis lumborum)
Educational content only — not medical advice.
Anatomy
A true deep intrinsic dorsal back muscle connecting the accessory process of one lumbar vertebra to the mammillary process of the vertebra immediately inferior. Situated medial to the lateral intertransversarius, it is innervated by the dorsal rami of lumbar spinal nerves. It acts predominantly as a micro-stabilizer of the facet (zygapophysial) joint capsule and provides dense proprioceptive feedback during lumbar spinal motion.
Origin & insertion
From the accessory process of one lumbar vertebra, into the mammillary process of the vertebra below.
Action
Stabilizes the lumbar facet joints; participates subtly in lateral flexion and extension of the lumbar spine.
Innervation
Posterior (dorsal) rami of lumbar spinal nerves.
Clinical notes
Because it lies directly adjacent to the medial branch of the dorsal ramus, this muscle is intimately involved in lumbar facet arthropathy and pain targeted by facet radiofrequency denervation.
Related structures
Educational references
FAQ
What is the role of the Medial Lumbar Intertransversarius (Left)?
A true deep intrinsic dorsal back muscle connecting the accessory process of one lumbar vertebra to the mammillary process of the vertebra immediately inferior. Situated medial to the lateral intertransversarius, it is innervated by the dorsal rami of lumbar spinal nerves. It acts predominantly as a micro-stabilizer of the facet (zygapophysial) joint capsule and provides dense proprioceptive feedback during lumbar spinal motion.
Why is the Medial Lumbar Intertransversarius (Left) clinically important?
Because it lies directly adjacent to the medial branch of the dorsal ramus, this muscle is intimately involved in lumbar facet arthropathy and pain targeted by facet radiofrequency denervation.
Source & license
BodyParts3D, © The Database Center for Life Science licensed under CC Attribution 4.0 International (https://creativecommons.org/licenses/by/4.0/). license details