Quadratus lumborum muscle
Musculus quadratus lumborum
Stabilises the lumbar spine; acting on one side it bends the loin laterally.
About the quadratus lumborum muscle of the dog
Quadratus lumborum muscle is a muscle of the belly (abdomen), one on each side of the body. Its name in the Nomina Anatomica Veterinaria is Musculus quadratus lumborum. You can turn it above, see it in place in the belly of the dog, and open it inside the whole animal in Vetomica.
Where it runs from and to
A muscle is told apart from its neighbours by what it takes hold of at each end, which is also what decides what it does when it shortens.
- Origin
- Caudal thoracic vertebral bodies and every lumbar transverse process back to L7.
- Insertion
- Medial face of the iliac wing near the sacroiliac joint.
- Action
- Stabilises the lumbar spine; acting on one side it bends the loin laterally.
- Nerve
- Lumbar spinal nerves, by their ventral rami.
Written for Vetomica in its own words from the standard reference anatomy of the dog; the books it was checked against are listed below.
What it works on
Bones it takes hold of
- Thoracic vertebrae
- Lumbar vertebrae
- Ribs
- Ilium
Muscles and ligaments it works with
- Psoas major
- Psoas minor
- Intertransversarii lumborum
- Transversus abdominis
- Diaphragma pars lumbalis
Terminology
- English
- Quadratus lumborum muscle
- Latin (NAV)
- Musculus quadratus lumborum
- Status
- A valid term in the Nomina Anatomica Veterinaria
References
Where to read this structure in full, and where the named parts above were read.
- NAV 2017Myologia
- Miller's Anatomy of the Dog, 5th ed.The Muscular System: sublumbar muscles
- König & LiebichMuscles of the trunk: hypaxial muscles
- Miller 2020 (book pass)ch. 6 The Muscular System, PDF p. 600
Questions about the quadratus lumborum muscle
- What is the Latin name of the quadratus lumborum muscle?
- In the Nomina Anatomica Veterinaria, the quadratus lumborum muscle is called Musculus quadratus lumborum.
- Where is the quadratus lumborum muscle of the dog?
- Quadratus lumborum muscle is a muscle of the belly (abdomen), one on each side of the body.
- Which bones does the quadratus lumborum muscle attach to?
- Quadratus lumborum muscle takes hold of Thoracic vertebrae, Lumbar vertebrae, Ribs and Ilium.
- Where does the quadratus lumborum muscle originate and insert?
- Origin: Caudal thoracic vertebral bodies and every lumbar transverse process back to L7. Insertion: Medial face of the iliac wing near the sacroiliac joint.
- What nerve supplies the quadratus lumborum muscle?
- Lumbar spinal nerves, by their ventral rami.
- What does the quadratus lumborum muscle do?
- Stabilises the lumbar spine; acting on one side it bends the loin laterally.
See the quadratus lumborum muscle inside the whole dog.
Vetomica opens on this structure with every layer of the dog around it: peel back the skin and the muscles, cut a section through it, X-ray it, and practise naming it until you stop getting it wrong.
Free for 7 days, no card. After that the skeletons stay free.
