Iliacus & psoas major #muscle #anatomy 🦵 | Dr. Ishtiaque Arafat

Psoas major anatomy: The psoas major is a deep muscle that originates from the transverse processes, vertebral bodies, and intervertebral discs of T12 to L5. It travels downward through the pelvic cavity, passes deep to the inguinal ligament, and inserts into the lesser trochanter of the femur. Along its course, it lies adjacent to the lumbar plexus, ureter, and abdominal aorta. It’s innervated by branches of the lumbar plexus, primarily from spinal nerves L1 to L3, and occasionally L4. Function

Psoas Facts for Therapists: 1. It’s your only muscle connecting your spine to your legs. – The psoas major originates from T12–L5 and inserts on the lesser trochanter of the femur. No other muscle does that. It bridges the core and the legs—literally. 2. It might store emotional stress. – Some somatic therapists and movement specialists call it the “muscle of the soul” due to its deep fascial connections and role in the fight-or-flight response. (Vagus nerve and psoas have proximity through the