The psoas minor muscle ( or ; from ) is a long, slender skeletal muscle.[Tank (2005), p 93][Gray (2008), p 1372]
Structure
The psoas minor muscle originates from the vertical
Muscle fascicle inserted on the last thoracic and first
. From there, it passes down onto the medial border of the psoas major, and is inserted to the
Linea terminalis and the iliopectineal eminence. Additionally, it attaches to and stretches the deep surface of the
iliac fascia and occasionally its lowermost fibers reach the inguinal ligament.
[Bendavid (2001), p 58] It is posteriolateral to the
Iliopsoas Variations occur, however, and the insertion on the iliopubic eminence sometimes radiates into the iliopectineal arch.
[Platzer (2004), p 234]
The psoas minor muscle receives oxygenated blood from the four lumbar arteries (inferior to the subcostal artery) and the lumbar branch of the iliolumbar artery.
Innervation
The psoas minor muscle is
Nerve by direct branches of the
Lumbar nerves.
Variation
/ref> It has an average length of about 24 cm, of which about 7.1 cm is muscle tissue and about 17 cm is tendon.
Function
The psoas minor is a weak flexor of the lumbar vertebral column.
Other animals
The psoas minor muscle is present in other
Mammal, such as
Horse.
In horses, it may be palpated during rectal exams to check for causes of
back pain.
==Additional images==
Notes
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(ISBN for the Americas 1-58890-159-9.)
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