ISSN:
1432-0878
Keywords:
Imaginal disk
;
Insecta
;
Diptera
;
Sense organ
;
Ultrastructures
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
,
Medicine
Notes:
Summary The ultrastructure of the imaginal leg disk of Calliphora has been studied at three stages of the third larval instar. Several cell types can be distinguished: epithelial cells of the disk proper, the peripodial membrane and the apodemes; cells of the new tracheal branch; promyoblasts and sense cells. Between the different parts of the disk epithelium no structural differences are found. A preliminary morphometric study reveals that nuclear size differences do occur. The apodeme cells are very long and contain numerous microtubules. The promyoblasts are characterized by dilatations of the ER. The cells of the new tracheal branch resemble those of the disk epithelium but are larger and have less lipid vacuoles. Sense cells are found in a sense organ on the last tarsal segment, in a monoscolopale organ at the dorsal side of the disk and in a polyscolopale organ in the femurotibia region. They are partially enclosed by one or more sheath cells. In the scolopale organs the dendrites form a long cilium, which at the distal end is embedded in an extracellular substance, produced by a cap cell. The dendrites of the tarsal sense organ have a characteristic sheath and run through the peripodial cavity and the stalk to the hypoderm.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00307472
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