Summary
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1.
A detailed description is given of the structure of intercellular bridges connecting sister spermatogonia and spermatocytes in the testis as well as oocytes and nurse cells in the ovary of Drosophila melanogaster.
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2.
The differentiated type of intercellular bridge found in the ovary is called „fusom“, using a term introduced by Hirschler (1948, 1953). The fusoms differ from simple intercellular bridges by the fact that the opening is more or less closed by a specific sealing substance.
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3.
The sealing material seems to be produced by the stiff osmiophilic rim bordering the opening of the fusom.
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4.
Presumably the aperture of the fusom is controled by factors originating in the nurse cells, since both closed and opened fusoms are found to connect the same oocyte with different nurse cells.
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Meyer, G.F. Interzelluläre Brücken (Fusome) im Hoden und im Ei-Nährzellverband von Drosophila melanogaster . Zeitschrift für Zellforschung 54, 238–251 (1961). https://doi.org/10.1007/BF00338705
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DOI: https://doi.org/10.1007/BF00338705