Psoas Minor Muscle Of A Male As, Anterior View

Description

Arising from the lateral surfaces of the T12 and L1 vertebral bodies and intervening intervertebral disc, the psoas minor descends on the anterior surface of psoas major as a slender fusiform belly that quickly becomes a long, flat tendon. Its tendon continues inferiorly toward the pelvic brim to insert on the iliopubic eminence and pectineal line, lying medial to iliacus within the iliac fossa and anterior to the lumbar vertebral column. Bilateral psoas major muscles flank the midline spine, converging toward the lesser trochanter region, while the rib cage and bony pelvis frame the thoracoabdominal and pelvic cavity in an anterior torso view. Often absent. Recognition of psoas minor matters because it is a consistent source of confusion during dissection and cross-sectional correlation, where its tendon can be mistaken for fascia or for the medial border of the iliopsoas compartment. In anterior approaches to the lumbar spine and at the pelvic brim, the muscle and tendon sit in a corridor where surgeons work close to the genitofemoral nerve on the anterior surface of psoas major and to the sympathetic trunk, so clean identification supports safe teaching of exposure planes. Clinically, iliopsoas pathology and hematoma most often involve psoas major, but this view helps learners understand why psoas minor, when present, contributes little to hip flexion and is instead a minor flexor of the lumbar spine and stabilizer of the pelvic brim. Use this illustration in gross anatomy labs, orthopedic and spine surgery teaching files, or radiology instruction when labeling anterior lumbar landmarks and the iliopsoas complex. It also fits well in atlases and textbook chapters on posterior abdominal wall musculature, variant anatomy, and anterior approaches to L4 to S1. Anatomical accuracy verified by SciePro's Medical Advisory Board.