Quadratus lumborum muscle
| Quadratus lumborum muscle |
|---|
|
| origin |
| Iliac bone ( crista iliaca ) |
| approach |
| Lower edge of the lowest rib , transverse processes of the 1st – 4th Lumbar vertebrae |
| function |
| Lowering of the lowest, 12th pair of ribs, lateral inclination of the trunk |
| Innervation |
| Subcostal nerve and rami musculares from the lumbar plexus |
| Spinal segments |
| Th12 and L1-L4 |
The quadratus lumborum muscle ( Latin for "square lumbar muscle") is one of the deep abdominal muscles . It fills the area between the back of the iliac crest and the 12th rib. It is four-sided and it is wider at the bottom than at the top. The muscle is a continuation of the transversus abdominis muscle .
The muscle is covered behind by the deep sheet of the thoracolumbar fascia , in front by the fascia transversalis and the peritoneum . Together with the psoas major muscle , it forms the floor of the lumbar fossa ( fossa lumbalis ). The iliohypogastric nerve runs between the kidney bed and the quadratus lumborum muscle , before it continues into the abdominal wall between the transversus abdominis muscle and the obliquus internus abdominis muscle .
function
The quadratus lumborum muscle tilts the trunk to one side and lowers the 12th rib. In this way it forms a counter-traction to the diaphragm, which is important for stabilizing the lower ribs during inhalation. It is an auxiliary muscle for exhalation ( expiration ).
Individual evidence
- ↑ Michael Schünke: Functional Anatomy - Topography and Function of the Movement System . Georg Thieme, Stuttgart 2000, ISBN 978-3-13-118571-6 , p. 195 .
- ^ Hans Assmus, Gregor Antoniadis: Nervenkompressionssyndrome . Springer Science & Business Media, Berlin 2011, ISBN 978-3-7985-1818-6 , pp. 155 .
- ↑ Johannes W. Rohen, Elke Lütjen-Drecoll: Anatomie des Menschen . Schattauer, Stuttgart 2006, ISBN 978-3-7945-2535-5 , pp. 43 .
- ↑ Sieglinde Bogensberger: Taschenlexikon medicine . Elsevier, Urban & Fischer, 2004, ISBN 978-3-437-15011-1 , pp. 57 .