The cremasteric reflex is dependent upon the nerve roots L1 and L2.
This reflex is elicited by stroking the superior and medial part of the thigh in a downward direction. The normal response in males is a contraction of the cremasteric muscle that pulls up the scrotum and testis on the side stroked.
In children, the reflex may be overexaggerated and this can lead to the mistaken diagnosis of undescended testes.
Upper and lower motor neurone disorders can cause an absence of the cremasteric reflex.
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