Abstract:
:Neuroblast pattern, engrailed expression and proliferation in the subesophageal neuromers of the beetle Tenebrio molitor are characterized throughout embryogenesis. The proliferation of neuroblasts has been studied throughout postembyronic development. Serotonin, crustacean cardioactive peptide and tyrosine hydroxylase-like-immunoreactive neurons are characterized and their neuronal development has been studied. There is an initial posterior-anterior gradient in neuroblast segregation leading to a reduced number of neuroblasts in the frontal subesophageal neuromer. The study of the engrailed expression shows that only the anterior subfraction of the neuromeral neuroblast configuration is reduced, whereas the posterior two rows of engrailed-positive neuroblasts are not affected during the first 40% of embryogenesis. The overall number of proliferations in the first subesophageal neuromer reaches only 30-50% of the value found in each of the other two neuromers. The analysis of serotonin and crustacean cardioactive peptide immunoreactivity allows the identification of serial homologous neurons which persist from the early embryo to the adult stage. In the different gnathal neuromers, these neurons form structurally highly similar projection patterns, but show different extensions of their arborizations, corresponding to the relative size of each neuromer. Structural homologies between subesophageal and thoracic neuromers are discussed.
journal_name
Microsc Res Techjournal_title
Microscopy research and techniqueauthors
Breidbach O,Urbach Rdoi
10.1002/(SICI)1097-0029(19961015)35:3<180::AID-JEMsubject
Has Abstractpub_date
1996-10-15 00:00:00pages
180-200issue
3eissn
1059-910Xissn
1097-0029pii
10.1002/(SICI)1097-0029(19961015)35:3<180::AID-JEMjournal_volume
35pub_type
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