Quantitive variational extent of NOS positive neurons in the myenteric plexus of calf jejunum from 4-month-old to 6-month-old was bigger than that of duodenum and ileum.

• 4月龄到6月龄犊牛空肠肌间神经节的NOS阳性神经元数量变化与十二指肠和回肠相比变化较大；