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Innervation of the Psoas Major The psoas major muscle is innervated by the anterior rami of the lumbar spinal nerves L1, L2, and L3. Nerve Supply Source: ▪️The anterior rami of L1, L2, and L3 lumbar spinal nerves arise from the lumbar plexus, which is embedded within the psoas major muscle itself. Pathway: ▪️The anterior rami emerge from the intervertebral foramina and travel through the psoas major muscle. ▪️Branches provide motor innervation to the psoas major. Functional Contribution Primary

The tension lines of the psoas major muscle typically follow its anatomical course and function. The psoas major originates from the transverse processes of the lumbar vertebrae (L1-L5) and the sides of the T12-L5 vertebral bodies and intervertebral discs, running down towards its insertion on the lesser trochanter of the femur. Tension lines in the psoas major would primarily follow this vertical or diagonal path, from the lower back and sides of the lumbar spine through the pelvis and down tow