We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
Licht- und elektronenmikroskopische Untersuchung des Corpus cardiacum der Eintagsfliege <em>Ephemera danica</em> Müll. (Ephemeroptera: Ephemeridae) während der Metamorphose.
- Authors
Kaiser, Helmut
- Abstract
The corpus cardiacum (cc) of Ephemera danica is an unpaired organ in the dorsal wall of the aorta. During the last four instars there has been no significant change in the volume of the cc of the males. In the females, however, the cc enlarges in the final nymphal instar due to a thickening of the organ. Owing to a shortening prior to the subimaginal moult the volume has diminished in the subimagines and imagines. In the electron microscope different types of axons and secretory granules could be observed. The type a axons contain electron opaque granules with a mean diameter of 125 nm. The granules in the axons of type b are smaller (mean diameter 85 nm) and are more or less electron opaque, and the type of axons are filled with less electron opaque secrctory droplets with mean diameters of 170 nm. In the fourth type of axons (d) the granules are approximately the same size as those of the type a but are more irregular in shape. In addition to the different axons two cell types-interstitial and secretory cells--are described, and the probable mechanism of the release of neurosecretory material is discussed. During metamorphosis only minor changes were apparent at the ultrastructural level.
- Subjects
EPHEMERA danica; EPHEMERA (Insects); METAMORPHOSIS; AXONS; NEURONS; AORTA
- Publication
Acta Zoologica, 1980, Vol 61, Issue 2, p93
- ISSN
0001-7272
- Publication type
Article
- DOI
10.1111/j.1463-6395.1980.tb01295.x