**Question:** All of the following passing through lesser sciatic foramen, except:

A. Sciatic nerve
B. Common fibular nerve
C. Profunda femoris artery
D. Femoral artery

**Core Concept:**
The lesser sciatic foramen is a small bony opening located on the lateral aspect of the pelvis, near the piriformis muscle. It allows the passage of certain structures, primarily nerves and blood vessels, that supply the lower limbs. The sciatic nerve, common fibular nerve, and profunda femoris artery all pass through this foramen. However, the femoral artery does not.

**Why the Correct Answer is Right:**
The lesser sciatic foramen is a specific location in the human body, and understanding its anatomy is essential for medical professionals. Among the options provided, only the femoral artery does not pass through this foramen. The sciatic nerve, common fibular nerve, and profunda femoris artery all contain relevant structures that pass through the lesser sciatic foramen.

**Why Each Wrong Option is Incorrect:**

A. Sciatic nerve: The sciatic nerve is a major nerve that originates from the lower lumbar and sacral spinal cord segments and contains motor and sensory fibers. It passes through the greater sciatic foramen, not the lesser sciatic foramen.

B. Common fibular nerve: The common fibular nerve is a part of the sciatic nerve, which primarily passes through the greater sciatic foramen. However, a small portion of the fibular nerve also enters the lesser sciatic foramen, making it relevant here.

C. Profunda femoris artery: The profunda femoris artery is a branch of the femoral artery, which is responsible for supplying blood to the thigh muscles and is not part of the lesser sciatic foramen.

D. Femoral artery: The femoral artery is the main blood vessel in the thigh, carrying oxygenated blood from the heart to the lower limbs. It does not pass through the lesser sciatic foramen but enters the thigh through the inguinal canal.

**Clinical Pearl:**
Understanding the anatomy of the lesser sciatic foramen helps medical professionals identify potential sites of injury, compression or entrapment, and differential diagnoses. This is crucial for accurate diagnosis and treatment of lower limb pains or neurological deficits.