Bilateral variations of the psoas major and the iliacus muscles and presence of an undescribed variant muscle – accessory iliopsoas muscle

Split Femoral Nerve Due to Psoas Tertius Muscle: A Review with Other Cases of Variant Muscles Traversing the Femoral Nerve

“…Further dissection of both the femoral nerve and accessory slip of the iliacus muscle was then performed to fully expose the anatomy. Multiple studies have reported variant slips of the psoas and iliacus muscles, which may split the femoral nerve causing a potential risk for nerve entrapment [6]. In a large study of 121 cadavers, Vasquez, et al reported variations of iliacus and psoas muscles piercing the femoral nerve with piercing of the femoral nerve by a muscular slip, or a muscular slip/sheet covering the femoral nerve as it lay on the iliacus in 19 specimens (7.9%) [7].…”

Case Report: Bifid Iliopsoas Tendon Causing Refractory Internal Snapping Hip

“…Bifid iliopsoas tendon as a possible cause of snapping hip has been reported in one dynamic sonographic study [4]. Anatomic variation suggestive of bifid iliopsoas tendon also has been described [14,20]. We report of a rare complication of arthroscopic release of internal snapping hip attributable to a missed bifid iliopsoas tendon.…”

The pelvis

“…Jelev et al (2005) note, 'It was the only finding of such a muscle among 108 human cadavers examined over a period of 22 years. Jelev et al (2005) note, 'It was the only finding of such a muscle among 108 human cadavers examined over a period of 22 years.…”