Pipa R L, Novak F J
Cell Tissue Res. 1979 Sep 3;201(2):227-37. doi: 10.1007/BF00235059.
By back-filling the nervus corporis allati II (NCA2) with Co2+ and precipitating the sulfide, two groups of somata (A and B) are revealed on the ipsilateral side of the subesophageal ganglion (SG). These occur anteroventrally, adjacent to the midsaggital plane. Group A consists of two cells; group B of five. Their processes form two discrete tracts issuing dorsoposteriorly into the neuropile between and slightly behind the circumesophageal connectives (CEC). After producing separate arborization fields in the dorsal neuropile, the tracts circumscribe the base of the ipsilateral CEC, unite, and their seven fibers enter NCA2 anteriorly. Prograde diffusion reveals 4--6 NCA2 axons penetrating the corpus allatum (CA) near a cap-like neurohemal organ. These axons form the transverse allatal tract (TAT), from whence they branch amongst the CA cells, and into the "cap", the postallatal nerves, and the opposite CA. Electron microscopy of transverse sections demonstrates nine neurosecretory axons entering the SG through NCA2. Proximal to the CA, NCA2 consists of a central bundle of neurosecretory axons and a peripheral zone confluent with the CA "cap". Depending upon the level of sectioning, there are 7--20 axons at the center, and seven pass into the TAT. The peripheral zone has the structure of a neurohemal organ.
通过用Co2+对咽侧体神经II（NCA2）进行反向填充并沉淀硫化物，在咽下神经节（SG）同侧揭示出两组胞体（A组和B组）。这些胞体位于前腹侧，靠近矢状中线平面。A组由两个细胞组成；B组由五个细胞组成。它们的突起形成两条离散的束，向后背侧延伸到围食管连接（CEC）之间且略后方的神经纤维网中。在背侧神经纤维网中形成各自的分支区域后，这些束围绕同侧CEC的基部，合并，其七根纤维向前进入NCA2。顺行扩散显示4 - 6根NCA2轴突在一个帽状神经血器官附近穿透咽侧体（CA）。这些轴突形成横向咽侧体束（TAT），从那里它们在CA细胞之间分支，并进入“帽”、咽后神经和对侧CA。横切面的电子显微镜检查显示九条神经分泌轴突通过NCA2进入SG。在靠近CA处，NCA2由一束中央神经分泌轴突和一个与CA“帽”汇合的外周区组成。根据切片水平，中央有7 - 20根轴突，其中七根进入TAT。外周区具有神经血器官的结构。
