- May 2, 2026The L5-S1 disc is the most highly loaded lumbar disc, accepting the greatest mechanical stress from the combination of lumbar…
- May 2, 2026The lumbosacral junction is the transition zone between the mobile lumbar spine and the rigid sacrum, making it the highest-stress…
- May 2, 2026The intervertebral disc is a fibrocartilaginous structure between adjacent vertebral bodies consisting of a gelatinous nucleus pulposus centrally surrounded by…
- May 2, 2026The facet joints (zygapophyseal joints) are paired synovial joints at each vertebral level that guide spinal motion, transmit shear loads,…
- May 2, 2026The lateral femoral cutaneous nerve arises from L2-L3 and crosses the iliacus muscle obliquely, passing under or through the inguinal…
- May 2, 2026The lumbar plexus is formed within the substance of psoas major from the ventral rami of L1-L4, giving rise to…
- May 2, 2026The posterior rami of lumbar spinal nerves divide into medial branches (supplying the facet joints and multifidus) and lateral branches…
- May 2, 2026Motor branches to the quadratus lumborum arise from the ventral rami of T12 and L1-L4, entering the muscle on its…
- May 2, 2026The ilioinguinal nerve arises from L1 (with T12 contribution) just below the iliohypogastric nerve at the lumbar plexus level, emerging…
- May 2, 2026The genitofemoral nerve arises from L1-L2 and descends on the anterior surface of psoas major, dividing into genital and femoral…