This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General anatomy, Subject name: Anatomy
Contents of mesorectum are of except 
Select and explain. 
A. Inferior rectal vein, B. Superior rectal vein, C. Pararectal node, D. Inferior mesenteric plexus
A: Inferior rectal vein
Answer: A: Inferior rectal vein 
Explanation: Mesorectum is enclosed by mesorectal fascia which is derived from the visceral peritoneum, and is also known as visceral fascia of mesorectum, fascia propria of rectum or presacral wing of hypogastric sheath Upper rectum is derived from the embryological hind gut, it is surrounded by mesorectum and its contents namely superior rectal aery and its branches, superior rectal vein and tributaries, lymphatic vessels and nodes along superior rectal aery, branches from inferior mesenteric plexus to innervate rectum and loose adipose connective tissue down to the level of levator ani (pelvic floor). (Reference : I B Singh&;s Embryology, 10th edition)