Meirelles R M S, Rodrigues I S, Steindel M, Soares M J
Laboratory of Cellular Biology of Micro-organisms, Department of Cellular Ultrastructure and Biology, Oswaldo Cruz Institute-FIOCRUZ, Rio de Janeiro, RJ, Brazil.
J Submicrosc Cytol Pathol. 2003 Apr;35(2):199-207.
The fine structure of the salivary glands of the triatomine bug Rhodnius domesticus was investigated. Stereomicroscopy and scanning electron microscopy showed that each salivary gland pair contains two close and independent units: the larger is reddish and elongated (principal gland), while the smaller is round and translucent (accessory gland). The accessory gland opens at the base of the main excretion duct, which arises at the medial portion of the principal gland. An accessory duct emerges at the base of the main excretion duct, above the accessory gland opening, and runs towards the digestive tract. Transmission electron microscopy showed that both gland units are formed by a single layer of epithelial gland cells, surrounded by a thick basal lamina containing tracheolae and muscle cell fibers. Adjacent gland cells are interconnected by interdigitations of their lateral plasma membranes and by septate junctions. Microvilli are present at the apical domain of the gland cell plasma membrane, which allow faster diffusion of the saliva towards the gland lumen. Several mitochondria, abundant endoplasmic reticulum profiles and usually one elongated nucleus are observed in the gland cells. According to standard nomenclatures, the salivary gland cells can be classified as type I cells, secreting the saliva into a large gland lumen.
对家栖红猎蝽唾液腺的精细结构进行了研究。实体显微镜和扫描电子显微镜显示，每对唾液腺包含两个紧密且独立的单元：较大的呈红色且细长（主腺），而较小的呈圆形且半透明（副腺）。副腺开口于主排泄管的基部，主排泄管起源于主腺的内侧部分。一条副导管在主排泄管基部、副腺开口上方出现，并通向消化道。透射电子显微镜显示，两个腺体单元均由单层上皮腺细胞构成，周围环绕着一层厚厚的基膜，基膜内含有微气管和肌细胞纤维。相邻的腺细胞通过其外侧质膜的交错和分隔连接相互连接。微绒毛存在于腺细胞质膜的顶端区域，这使得唾液能够更快地扩散到腺腔内。在腺细胞中观察到多个线粒体、丰富的内质网轮廓以及通常一个细长的细胞核。根据标准命名法，唾液腺细胞可归类为I型细胞，将唾液分泌到一个大的腺腔内。
