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Fine structural features of developing leg discs of the blowfly, Sarcophaga bullata (Parker)
Author(s) -
Chiarodo Andrew J.,
Denys Francis R.
Publication year - 1968
Publication title -
journal of morphology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.652
H-Index - 74
eISSN - 1097-4687
pISSN - 0362-2525
DOI - 10.1002/jmor.1051260305
Subject(s) - biology , endoplasmic reticulum , organelle , instar , ultrastructure , microbiology and biotechnology , anatomy , electron microscope , flesh fly , insect , larva , botany , physics , optics
The mesothoracic leg discs of the blowfly, Sarcophaga bullata (Parker) were studied by electron microscopy during the third larval instar. As the peripodial membrane and separation form, the cells of the disc become elongated and perpendicularly oriented toward the separation. The cellular organelles do not undergo significant changes until the late third instar. At this time, there is a significant increase in the amount of granular endoplasmic reticulum and in the number of inclusions, particularly in those cells located more deeply in the disc. Nucleolar enlargement and an increase in the number of mitochondria are also observed at this time. The cells at the border of the disc form a columnar epithelium whose surface develops microvilli‐like projections. These projections. These projections reach their maximum development towards the end of third instar. It is suggested that some of the observed changes may represent a phenotypic expression of secretion of cuticular material.