Psoas Minor Located, Gross Anatomy

Description

Seen on the posterior abdominal wall, the psoas minor appears as a slender fusiform muscle lying anterior and slightly medial to psoas major, with its belly tapering inferiorly into a long tendon. Superior fibers arise from the bodies and intervertebral disc of T12 to L1, just inferior to the diaphragmatic crura, while the tendon descends along the medial margin of the iliopsoas. Inferiorly it blends with the iliac fascia and anchors near the pelvic brim, typically at the iliopubic eminence and pectineal line, positioned medial to iliacus within the iliac fossa and superior to the pelvic inlet. Absence is common. When present, this small flexor of the lumbar spine and tensor of the fascia iliaca becomes clinically relevant as a landmark during retroperitoneal exposure of the lumbar vertebral bodies and the lumbosacral junction, where distinguishing psoas minor from the bulkier psoas major helps orient the surgeon before mobilizing the iliopsoas. Its long tendon can also be a source of anterior hip or groin pain (psoas minor syndrome), and the illustration’s emphasis on a relatively thin belly reflects the variable development often encountered in female cadaveric dissection. Anatomy faculty will find this view useful when teaching the iliopsoas region in gross anatomy, kinesiology, and physical therapy curricula, including discussions of variant musculature and fascial continuities at the pelvic brim. It also supports surgical atlases and radiology teaching files that correlate retroperitoneal anatomy with CT or MRI slices through T12 to L2 and the iliac fossa. Anatomical accuracy verified by SciePro's Medical Advisory Board.