All are contents of Femoral Triangle EXCEPT:
**Core Concept**
The femoral triangle is an anatomical region in the anterior thigh, bounded by the inguinal ligament, the medial border of the sartorius muscle, and the medial border of the adductor longus muscle. It contains several vital structures that are essential for the function of the lower limb.
**Why the Correct Answer is Right**
The femoral triangle contains the femoral artery, femoral vein, and femoral nerve, which are crucial for the blood supply and innervation of the lower limb. The femoral artery is a continuation of the external iliac artery, and it divides into the superficial and deep branches within the triangle. The femoral vein is formed by the union of the great saphenous and deep femoral veins. The femoral nerve is derived from the lumbar plexus and provides motor and sensory innervation to the lower limb.
**Why Each Wrong Option is Incorrect**
**Option A:** The femoral canal is a small, oblique, and narrow structure located at the medial margin of the femoral sheath, containing the lymphatic vessels, the lymphatic vessels of the lower limb, and the lymph nodes. It is indeed a content of the femoral triangle, so this option is incorrect for the purpose of this question.
**Option B:** The saphenous nerve is a sensory nerve that arises from the femoral nerve and supplies the skin of the medial aspect of the leg and foot. It is not a content of the femoral triangle, so this option is correct.
**Option C:** The profunda femoris artery is a branch of the femoral artery that arises within the femoral triangle. It is a content of the femoral triangle, so this option is incorrect for the purpose of this question.
**Option D:** The femoral vein is formed by the union of the great saphenous and deep femoral veins within the femoral triangle. It is indeed a content of the femoral triangle, so this option is incorrect for the purpose of this question.
**Clinical Pearl / High-Yield Fact**
The femoral triangle is a common site for the insertion of central venous catheters and for the administration of regional anesthesia. The femoral nerve block is commonly used for postoperative pain relief in patients undergoing lower limb surgery.
**Correct Answer: B. Saphenous nerve**