Tsuneki K, Gorbman A
Cell Tissue Res. 1975;157(2):165-84. doi: 10.1007/BF00222064.
The pars intermedia of the adult lamprey is separated by perivascular spaces and a capillary plexus from the pars nervosa. No penetration of nerve fibers into the pars intermedia was found. The pars nervosa, which constitutes the posterior wall of the infundibulum, consists of an ependymal layer and a fuchsinophilic fiber layer; the latter contains at least four different types of axonal endings. The pars intermedia is avascular and is composed of a small proportion of non-secretory cells and a large proportion of secretory cells. The secretory granules in the cells of the pars intermedia seem to be discharged toward the capillaries that separate the pars intermedia from the pars nervosa. Although no direct nervous or vascular connections were found between the pars nervosa and pars intermedia, a mechanism of control of secretory activity in the pars intermedia cells by the central nervous system appears likely.
成体七鳃鳗的中间部通过血管周围间隙和毛细血管丛与神经部分开。未发现神经纤维侵入中间部。构成漏斗后壁的神经部由室管膜层和嗜品红纤维层组成；后者包含至少四种不同类型的轴突终末。中间部无血管，由一小部分非分泌细胞和一大部分分泌细胞组成。中间部细胞中的分泌颗粒似乎朝着将中间部与神经部分开的毛细血管排出。虽然在神经部和中间部之间未发现直接的神经或血管连接，但中枢神经系统对中间部细胞分泌活动的控制机制似乎是可能的。
