Psoas Minor, Anterior View

Description

Running along the anterior lumbar spine, the psoas minor appears as a slender, flattened muscle belly lying superficial to the bulk of psoas major, with its fibers oriented inferiorly toward the pelvic brim. Superiorly, it relates to the lower thoracic and upper lumbar vertebral bodies and the adjacent intervertebral discs, while laterally it remains close to the medial margin of psoas major rather than the iliacus in the iliac fossa. Inferiorly, its tendon tracks toward the iliopubic eminence and pecten pubis, passing anterior to the hip joint as the femoral head sits deep within the acetabulum. Small muscle. Big landmark. Because psoas minor is absent in a sizable proportion of individuals, an anterior view that separates it from psoas major helps prevent mislabeling on exams and in atlases, and it clarifies why isolated psoas minor strain is uncommon compared with iliopsoas pathology. This perspective also supports clinical anatomy teaching around the lumbar plexus and anterior hip region, since femoral nerve irritation and iliopsoas tendinopathy tend to track with the larger psoas major and iliacus, not the thin psoas minor, even though all sit closely against the anterior vertebral column and pelvic brim. For surgeons and radiologists, distinguishing the psoas compartment from adjacent retroperitoneal structures underpins safe approaches to lumbar spine exposure and interpretation of psoas hematoma or abscess spread along the fascial plane. Use this illustration in musculoskeletal anatomy labs, pelvic and hip modules, and operative anatomy texts discussing anterior lumbar approaches (including ALIF) where the psoas mass and its superficial layers frame the corridor. It also suits radiology teaching files that correlate CT or MRI cross sections with anterior surface anatomy from the lower ribs to the proximal femur. Anatomical accuracy verified by SciePro's Medical Advisory Board.