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 • Pr
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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 • Pr
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