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genitofemoral nerve
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The genitofemoral nerve is seen here piercing through and then descending on the anterior surface of the psoas major muscle. The genitofemoral nerve is formed from contributions from L1-L2.

The cremaster reflex is a test of the L1 spinal segment, in which the genitofemoral nerve is responsible for innervation of the cremaster muscle.

During removal of external iliac lymph nodes, the surgeon should be careful not to damage the genitofemoral nerve located lateral to these nodes.
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