Psoas minor innervation is a branch of which spinal level?

Psoas minor innervation is a branch of which spinal level?

• A. Branch of L2
• B. Ventral Rami L1-L2
• C. Branch of L1
• D. Branch of L3

Answer: (C)

The psoas minor is innervated by a small branch from the first lumbar nerve (L1) via its ventral ramus. This specific L1 branch provides the motor supply to this tiny muscle, which sits in front of the psoas major and is often considered a minor contributor to the lumbar plexus. Because its innervation comes from L1 alone, it isn’t typically supplied by L2 or L3, nor by a combined L1-L2 set of fibers, making the branch of L1 the best answer.

The psoas minor is innervated by a small branch from the first lumbar nerve (L1) via its ventral ramus. This specific L1 branch provides the motor supply to this tiny muscle, which sits in front of the psoas major and is often considered a minor contributor to the lumbar plexus. Because its innervation comes from L1 alone, it isn’t typically supplied by L2 or L3, nor by a combined L1-L2 set of fibers, making the branch of L1 the best answer.