Purpose: Some studys had show that pylorus stenosis is due to the absent of NOS and Vasoactive intestinal peptide(VIP) nerves in pylorus sphincter, in this study.

• 目的：既往的研究表明幽门括约肌的收缩与舒张受胆碱能神经、肾上腺素能神经、多肽能神经和NOS神经的调节。