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Figure 10


Fig. 10. The venous space (VS) and its connection to the anterior heart (H) in the first abdominal segment in D. melanogaster. View towards the mesophragma (Ph II). (A,B,D,E) SEMs; (C) light microscopy. (A) Opened anterior heart chamber, surrounded by the pericardial diaphragm (PD) and the fat body (FB). (B) Detail from A, showing the protruding valve cells of the first ostium. (C) Light micrograph of the first abdominal segment, showing the tergo-pleural muscles (M), pericardial diaphragm (PD) and aorta (Ao). Sectioned at the level of the posterior end of the (collapsed) conical heart chamber (H). Most fat body (FB) on the left side is removed. (D) NaOH-maceration preparation of the anterior abdomen. Cuticular ridge (CR), arising from the posterior metanotum and giving rise to the cuticular septum (CS), bordering the venous channel. (E) View as in D after removal of the pericardial diaphragm to show the anterior heart attachment by connective tissue strands (CT) and opening of the venous channel. PD, tissue remnants of the pericardial diaphragm. (F) Schematic illustration of components involved in hemolymph transport of the anterior heart.). Ant OC, anterior ostial valve cell; AS 1, first abdominal segment; FG, fat granule; M, tergo-pleural muscle; O1, first ostium; Post OC, posterior valve cell; PS, pleural septum; VC, venous channel; VF, ventral foramen; VS, venous space.





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