This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Abdomen and pelvis, Subject name: Anatomy
Pyramidalis is supplied by 
Select and explain. 
A. Subcostal nerve, B. Ilioinguinal nerve, C. Iliohypogastric nerve, D. Genitofemoral nerve
A: Subcostal nerve
Answer: A: Subcostal nerve 
Explanation: The pyramidalis is a small and triangular muscle, anterior to the rectus abdominis, and contained in the rectus sheath. The muscle is innervated by the ventral poion of T12. Anterior division of the twelfth thoracic nerve (subcostal nerve) communicates with the iliohypogastric nerve of the lumbar plexus and gives a branch to the Pyramidalis. Ref - semantischolar.org