Final answer:
The fat-filled triangle, which contains the LFCN, is found in the inguinal region. This region is located in the lower abdomen, just above the inguinal ligament. The LFCN, or lateral femoral cutaneous nerve, runs through this triangle.
Step-by-step explanation:
The fat-filled triangle, which contains the LFCN, is found in the inguinal region. This region is located in the lower abdomen, just above the inguinal ligament. The LFCN, or lateral femoral cutaneous nerve, runs through this triangle, which is formed by the inguinal ligament, the sartorius muscle, and the adductor longus muscle.