Sensory supply of medial side of thigh is –
**Core Concept**
The sensory supply of the medial side of the thigh is provided by the saphenous nerve, which is a branch of the femoral nerve. The femoral nerve arises from the lumbar plexus and is responsible for innervating the muscles and skin of the anterior thigh.
**Why the Correct Answer is Right**
The saphenous nerve is a purely sensory nerve that supplies the medial aspect of the thigh, including the skin and subcutaneous tissue. It arises from the femoral nerve, which is formed by the union of the L2-L4 nerve roots. The saphenous nerve then descends along the medial aspect of the thigh, providing sensory innervation to the skin and superficial fascia.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is likely referring to the obturator nerve, which supplies the medial compartment of the thigh but is primarily motor in function. It is not responsible for the sensory supply of the medial side of the thigh.
**Option B:** This option may be referring to the sciatic nerve, which is a major nerve of the lower limb but has a different distribution. The sciatic nerve is primarily responsible for the innervation of the posterior thigh and leg.
**Option C:** This option is likely referring to the femoral nerve itself, which is responsible for the innervation of the anterior thigh but not the medial side.
**Clinical Pearl / High-Yield Fact**
The saphenous nerve is vulnerable to injury during surgical procedures such as knee arthroscopy or saphenous vein stripping. Knowledge of the saphenous nerve's course and function is essential for surgeons to avoid nerve damage and prevent postoperative neuropathy.
**Correct Answer: A. Saphenous nerve.**