All cells have secretory and absorptive functions besides4ibblasts and granular cells in connective tissue, there are myofibril, collagenous fibril and unmyelinated fibers. 结缔组织中除有成纤维细胞和颗粒细胞外还充满胶原原纤维和肌原纤维,无髓神经原纤维也较多。
The intact secretory granules ( 100~ 300nm) coated with membrane exist not only in the endings or varicosities of the unmyelinated nerve fibers but also occasionally in the perivascular space. 完整的大型膜包分泌颗粒(100~300nm),不仅大量存在于无髓神经纤维的终末或膨体内,而且也见于血管周隙内。