However,the neuron density decreased by39%(AchE) and40%(NOS) in12months of age comparing with that of15days of age.

• 3)小肠肌间神经丛中,12月龄的AchE和NOS阳性神经元总数比15日龄的增加163%25和137%25,但阳性神经元密度降低39%25(AchE)和40%25(NOS)。