During a posterior lumbar interbody fusion (PLIF) surgery, the surgeon must understand the relationship between the lumbar plexus and the vertebral bodies. The genitofemoral nerve (L1-L2) emerges from which part of the psoas major muscle?

• A Medial border
• B Posterolateral border
• C Anterior surface ✓
• D It passes through the substance of psoas major

Explanation

The genitofemoral nerve (L1-L2) emerges from the anterior surface of the psoas major muscle and runs downward on its surface. It divides into genital and femoral branches. The femoral nerve (L2-L4) emerges from the posterolateral border of psoas major. The obturator nerve (L2-L4) emerges from the medial border. The genitofemoral nerve's anterior position makes it vulnerable during retroperitoneal approaches and psoas muscle dissection.

Reference: Gray's Anatomy, 42nd ed.

High-yield for: NEET PGINI-CETNExTFMGEUSMLEPLABMRCP

Written and medically reviewed by the StethoPrep medical team.