Psoas minor muscle
Psoas minor muscle |
---|
Lumbar and thigh muscles |
origin |
12th thoracic and 1st lumbar vertebrae |
approach |
with arcus iliopectineus and eminentia iliopubica of the pubic bone |
function |
Lumbar spine : flexion ( inclination ) and lateral inclination ( lateral flexion ) |
Innervation |
Iliohypogastric nerve |
Spinal segments |
L1 and L2 |
The psoas minor muscle ( Latin for "small lumbar muscle") is a skeletal muscle of the lower extremity , more precisely the front ( ventral ) layer of the rear ( dorsal ) hip muscles. In humans it is inconsistent; depending on the author, it is developed in 30 to 50% of individuals. It is functionally combined with the large lumbar muscle ( psoas major muscle ) and the iliac muscle ( iliacus muscle ) to form the lumbar and iliac muscle ( iliopsoas muscle ).
course
The origin of the small lumbar muscle are the twelfth thoracic vertebra - and the first lumbar vertebra .
It radiates with a long tendon into the muscle band ( fascia iliaca ), which surrounds it together with the large lumbar muscle and the iliac muscle, in particular into the arched ligament ( arcus iliopectineus ) between the inguinal ligament ( ligamentum inguinale ) and the eminentia iliopubica of the pubic bone .
In quadruped mammals , the muscle attaches independently of the lumbar iliac muscle to a small hump ( tuberculum musculi psoas minoris ) on the iliac bone .
function
The effect of the small lumbar muscle as a single muscle is of no great importance. With one-sided tension it causes a sideways inclination ( lateral flexion ) and with bilateral tension it causes a flexion ( inclination ) in the lumbar spine .
Clinical significance
In the house cat , the muscle shows up in a lateral view of the rib cage as a soft tissue shadow, which leads to an apparent displacement of the upper rear edge of the lungs from the spine.
Individual evidence
- ^ Wayne Vogl, Adam WM Mitchell: Anatomy for Students . Elsevier, Urban & Fischer-Verlag, 2007, ISBN 978-3-437-41231-8 , p. 324.
- ↑ Waldeyer anatomy of man. 17th edition. Walter de Gruyter, 2002, ISBN 3-11-016561-9 , p. 1139.
- ↑ Ursula Wappelhorst among other things: Text and workbook functional anatomy . Elsevier, Urban & Fischer-Verlag 2005, ISBN 3-437-48030-8 , p. 219.
- ↑ Franz-Viktor Salomon: muscle tissue. In: Anatomy for veterinary medicine. 2nd ext. Edition. Enke, Stuttgart 2008, ISBN 978-3-8304-1075-1 , pp. 147-234.
- ↑ Heike Karpenstein: Radiographic pulmonary diagnostics. In: Small Animal Medicine. 5-2013, pp. 240-248.