晚近由于辣根过氧化物酶(HRP)追踪技术和放射自显影技术的应用,使神经纤维联系的研究进入了一个新时代,但是,神经系构造极为复杂,这些方法尚不能完全满足研究工作的需要。一些学者一直在探求更加敏感的神经示踪剂。近几年发现了霍乱毒素、破伤风毒素神经生长因子、一些荧光素和一些植物凝集素(Lectin,LT)等都可被神经终末摄取而进行逆行或顺行传递。因此它们都可作为神经示踪剂应用在中枢和周围神经的纤维 Recently, studies on the relationship between nerve fibers have entered a new era due to the HRP tracking and autoradiography. However, the structure of the nervous system is extremely complicated and these methods can not fully meet the needs of the research need. Some scholars have been looking for more sensitive neurotracer. In recent years, cholera toxin, tetanus toxin nerve growth factor, some fluorescein and some plant lectins (Lectin, LT) were found to be able to be taken up by the nerve terminal for retrograde or cis-delivery. Therefore, they can be used as nerve tracers in the central and peripheral nerve fibers