**Question:** Which of the following muscle is supplied by obturator nerve:

A. Adductor longus
B. Adductor brevis
C. Obturator externus
D. Adductor magnus

**Correct Answer:** C. Obturator externus

**Core Concept:**
The obturator nerve is a mixed nerve that originates from the ventral rami of L2 to L5 and S1 spinal nerves. It supplies motor innervation to the muscles of the thigh and sensory innervation to the inner aspect of the thigh and the medial aspect of the knee joint.

**Why the Correct Answer is Right:**
The obturator nerve supplies the obturator externus muscle, which is responsible for external rotation and abduction of the hip joint. Obturator externus is located on the medial aspect of the thigh, making it the correct answer among the given options.

**Why Each Wrong Option is Incorrect:**
A) Adductor longus and B) Adductor brevis are supplied by the femoral nerve, not the obturator nerve.
D) Adductor magnus is supplied by the femoral nerve and tibial nerve, not the obturator nerve.

**Clinical Pearl:**
Understanding the innervation patterns of nerves is crucial in assessing and treating lower limb motor and sensory deficits, as well as in understanding the surgical anatomy of the thigh and hip region.