Cremasteric muscle is supplied by –
**Core Concept**
The cremasteric muscle is a part of the spermatic cord in the male reproductive system, responsible for regulating the temperature of the testes. It is a skeletal muscle that plays a crucial role in the process of spermatogenesis.
**Why the Correct Answer is Right**
The cremasteric muscle is supplied by the genital branch of the genitofemoral nerve, which arises from the L1 and L2 spinal nerves. This nerve branch provides motor innervation to the cremaster muscle, allowing it to contract and relax in response to changes in temperature. The cremasteric reflex, which is the contraction of the cremaster muscle in response to stroking the skin of the upper inner thigh, is a useful clinical sign for assessing the integrity of the genitofemoral nerve.
**Why Each Wrong Option is Incorrect**
* **Option A:** The cremasteric muscle is not supplied by the ilioinguinal nerve, which provides sensory innervation to the scrotum and spermatic cord.
* **Option B:** The cremasteric muscle is not supplied by the obturator nerve, which provides motor innervation to the adductor muscles of the thigh.
* **Option C:** The cremasteric muscle is not supplied by the pudendal nerve, which provides motor innervation to the external genitalia.
**Clinical Pearl / High-Yield Fact**
The cremasteric reflex is an important clinical sign that can be used to assess the integrity of the genitofemoral nerve. A diminished or absent cremasteric reflex can be indicative of nerve damage or compression.
**Correct Answer: A. Genital branch of the genitofemoral nerve**