Premium
A comparative study of the embryological development of the median cord in hemiptera
Author(s) -
Springer Charles Anthony,
Rutschky Charles W.
Publication year - 1969
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.1051290402
Subject(s) - biology , hemiptera , anatomy , cord , nucleolus , spinal cord , cytoplasm , zoology , microbiology and biotechnology , neuroscience , geometry , mathematics
Median cord development is uniform in six families of Hemiptera and five non‐hemipterans. The median cord arises independently from the lateral cords and is histologically distinguishable from the latter throughout development. Intrasegmentally, median cord nuclei possess prominent nucleoli and many small chromatin granules surrounded by clear nuclear sap. This region forms what appear to be glial elements at the midline of the neuropile. Intersegmentally, a spherical clump of eight to twelve large nuclei develops surrounded by dark‐staining granular cytoplasm. Each intersegmental clump migrates anteriorly into the preceding ganglionic region but degenerates soon after katatrepsis.