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- Title
Musculus psoas quartus: possible effects of such a unusual muscle presence in daily life.
- Authors
Pınar, Yelda; Gökmen, Figen Gövsa; Myrzabayeva, Raushan
- Abstract
Objective: M. psoas major, m.iliacus and m.guadratus lumborum are the muscles responsible for spinal flexion, rotation and pelvic tilt. The presence of anusual muscles in this area may cause symptoms such as movement limitation and pain. Methods: Pelvis dissection was performed during training dissections in the anatomy laboratory of Ege University, Faculty of Medicine. Variation was observed in the iliacus muscle. Results: It was determined that the medial half of the m.iliacus started at a higher level, from the anterior surface of the deep fascia of the quadratus lumborum muscle, and joined the m. iliacus distally. Tubbs describes the psoas quartus variation lateral to the psoas major muscle. He described it as originating from the proc. transversus and the medial aspect of the quadratus lumborum muscle. Few variations of the psoas major muscles have been reported in the literature. Tubbs et all reported a variation of the psoas called the "psoas quartus muscle". Perhaps aggressive femoral nerve growth during the fourth or fifth week of development may have been the cause of disruption of the undifferentiated iliacus-psoas muscles, leading to "redirection" of the development of the typical iliopsoas musculature into multiple variations. Conclusion: In anterior pelvic tilt, m.quadratus lumborum is stretched. Such a muscle band associated with it will have a negative impact on this physiological situation. In the pelvic rotation that occurs during walking, muscle variations in the pelvis or accessory muscle fibers may also affect the n.femoralis.
- Subjects
PSOAS muscles; QUADRATUS lumborum muscles; ILIOPSOAS muscle; FEMORAL nerve; PELVIS; EVERYDAY life
- Publication
Anatomy: International Journal of Experimental & Clinical Anatomy, 2024, Vol 18, pS24
- ISSN
1307-8798
- Publication type
Abstract