Chiang R G, Chiang J A, Davey K G
Department of Biology, York University, Ontario, Canada.
J Morphol. 1990 Apr;204(1):9-23. doi: 10.1002/jmor.1052040103.
The dorsal vessel (DV) in the abdomen of the blood-feeding insect Rhodnius prolixus was divided functionally into two regions, the heart, into which haemolymph entered the DV through four pairs of ostia located in abdominal segment VII, and the aorta, along which the haemolymph was propelled from abdominal segment VI to the thorax. Osmium-fixed whole mounts revealed the DV to consist of spirally arranged striated muscle fibers and to possess two rows of ventrally attached longitudinal fibers extending the length of the abdomen. Seven pairs of alary muscles were found attached to the DV in the posterior abdominal segments. Contractions of the alary muscles attached to the ventral surface of abdominal segments VII and VIII served to expand the heart. Electron microscopy revealed the DV to consist of a thin layer of contractile elements surrounded by an inner (intima) and outer (adventitia) connective tissue layer. Embedded in the intima along each lateral side of the DV were two large groups of endocardial cells extending the length of the DV. A small group of pericardial cells was embedded in the adventitia along the mid-ventral side of the DV, and clusters of pericardial cells were found attached to the alary muscles. Nerve terminals were found only on the heart: they contained agranular synaptic vesicles approximately 30 nm in diameter and densely stained granules approximately 100-120 nm in diameter. These structural components are discussed in relation to the role of the DV in circulation.
吸血昆虫红带锥蝽腹部的背血管（DV）在功能上可分为两个区域，即心脏，血淋巴通过位于腹部第七节的四对心门进入背血管；以及主动脉，血淋巴沿主动脉从腹部第六节被推进到胸部。锇固定的整体标本显示，背血管由螺旋排列的横纹肌纤维组成，并具有两排腹侧附着的纵向纤维，延伸至腹部全长。在腹部后部节段发现七对翼肌附着于背血管。附着于腹部第七节和第八节腹面的翼肌收缩可使心脏扩张。电子显微镜显示，背血管由一层薄的收缩元件组成，周围是内层（内膜）和外层（外膜）结缔组织层。沿着背血管的每一侧，内膜中嵌入了两大组心内膜细胞，延伸至背血管全长。一小群围心细胞沿着背血管腹中线一侧嵌入外膜，并且发现围心细胞簇附着于翼肌。仅在心脏上发现神经末梢：它们含有直径约30nm的无颗粒突触小泡和直径约100 - 120nm的深染颗粒。结合背血管在循环中的作用对这些结构成分进行了讨论。
