Kouji Yasuyama    Department   Kawasaki University of Medical Welfare  ,    Position   Professor with Special Assignment
Article types	原著
Language	English
Peer review	Non peer reviewed
Title	Fine structure of the spermathecal duct of the cricket, Gryllus bimaculatus.
Journal	Formal name：Kawasaki Medical Journal, Liberal Arts and Science course ISSN code：03865398
Volume, Issue, Page	13,pp.81-93
Author and coauthor	Yasuyama Kouji
Publication date	1987/12
Summary	The spermathecal duct of Gryllus bimaculatus is lined with a cuticular intima. Its wall consisits of three cellular types: glandular cells, ductule carrying cells and epithelial cells. The glandular cells are absent from the proximal region near the junction of the duct with the genital chamber and from the distal region near the junction with the spermatheca. They are restricted to the median region where the spermathecal duct is highly convoluted. Each glandular cell has a cavity formed by an invagination of the apical cytoplasmic membrane. The cavity of the glandular cells and the lumen of the spermathecal duct are connected by a cuticular efferent ductule which is surrounded by a ductule carrying cell. The epithelial cells contain bundles of longitudinally arranged microtubules and large deposits of glycogen. In the epithelial cells, mitochondria are distributed mostly in the apical cytoplasmic zone. The concentration of mitochondria in the apical zone suggests their involvement in ion transport required for the regulation of the microenvironment within the lumen of the spermathecal duct. The muscle fibers surrounding the spermathecal duct are innervated by axons which contain electron-dense vesicles. The presence of glandular cells in the spermathecal duct is characteristic of G. bimaculatus.