Psoas minor muscle
| Psoas minor muscle | |
|---|---|
 Muscles of the iliac and anterior femoral regions (psoas minor visible near top right) | |
| Details | |
| Origin | Lateral surface bodies of T12 and L1 vertebrae and intervening intervertebral disc |
| Insertion | Pectineal line and iliopubic eminence |
| Nerve | Anterior ramus of nerve L1 |
| Actions | Weak trunk flexor |
| Antagonist | Gluteus maximus |
| Identifiers | |
| Latin | Musculus psoas minor |
| MeSH | A02.633.567.825 |
| Dorlands /Elsevier | m_22/12550283 |
| TA | A04.7.02.005 |
| FMA | 22350 |
The psoas minor is a long, slender skeletal muscle which, when present, is located anterior to the psoas major muscle.[1][2]
Structure
Psoas minor originates from the vertical fascicles inserted on the last thoracic and first lumbar vertebrae. From there, it passes down onto the medial border of the psoas major, and is inserted to the innominate line 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.[3] Variations occur, however, and the insertion on the iliopubic eminence sometimes radiates into the iliopectineal arch.[4]
Morphology
The psoas minor is considered inconstant and is often absent, only being present in about 27% of human specimens studied. [5] It has an average length of about 24cm, of which about 7.1cm is muscle tissue and about 17cm is tendon.
Function
The psoas minor is a weak flexor of the lumbar vertebral column.
Additional images
Right hip bone, internal surface
Right femur, posterior surface
Psoas minor muscle
Psoas minor muscle
Psoas minor muscle
Notes
- ↑ Tank (2005), p 93
- ↑ Gray (2008), p 1372
- ↑ Bendavid (2001), p 58
- ↑ Platzer (2004), p 234
- ↑ Mcg Farias (1 Jan. 2012). Morphological and morphometric analysis of Psoas Minor Muscle in cadavers. ResearchGate. Retrieved from https://www.researchgate.net/publication/280236296_Morphological_and_morphometric_analysis_of_Psoas_Minor_Muscle_in_cadavers
References
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Wikimedia Commons has media related to Psoas minor muscles. |
- Bendavid, Robert; Abrahamson, Jack; Arregui, Maurice E. (2001). Abdominal Wall Hernias: Principle and Management. Springer. ISBN 0-387-95004-4.
- Platzer, Werner (2004). Color Atlas of Human Anatomy, Vol 1: Locomotor system (5th ed.). Thieme. ISBN 3-13-533305-1. (ISBN for the Americas 1-58890-159-9.)
- Tank, Patrick W. (2005). Grant's Dissector (13th ed.). Hagerstown, MD: Lippincott Williams & Wilkins. ISBN 0-7817-5484-4.
- Gray, Henry; Standring, Susan (2008). Gray's Anatomy - The Anatomical Basis of Clinical Practice (40th ed.). Churchill Livingstone - Elsevier. ISBN 978-0-443-06684-9.