Moreover, the serotonin-immunoreactive varicose fibres form thick neural network in the central body surrounding neuropils and the suboesophageal ganglion (SOG).

• 5-HT阳性反应在柄、侧副叶、脑前桥侧髓和中央体的大部分及其周围的前脑髓区最强，并且5-HT阳性纤维在中央体周围的髓区和咽下神经节处形成了密集的网络。