Sterba G, Hoheisel G, Wegelin R, Naumann W, Schober F
Brain Res. 1979 Jun 15;169(1):55-64. doi: 10.1016/0006-8993(79)90373-1.
In the descending part of the classical neurosecretory system, the axon terminals are not differentiated or they take the form of presynaptic elements which then form synaptoids or synapses with pituicytes or adenohypophyseal glandular cells respectively. In contrast, the axon terminals of the ascending part fulfil the criteria of true presynaptic elements which form synapses with other neurones. The presence of neurophysin vesicles in the presynaptic element is a particular morphologic feature of these neuro-neuronal synapses.
在经典神经分泌系统的下行部分，轴突终末未分化，或者呈突触前元件的形式，随后分别与垂体细胞或腺垂体腺细胞形成类突触或突触。相比之下，上行部分的轴突终末符合与其他神经元形成突触的真正突触前元件的标准。突触前元件中神经垂体素囊泡的存在是这些神经-神经元突触的一个特殊形态学特征。
