By P. D. Evans
Insect body structure is presently present process a revolution with the elevated software of molecular organic thoughts to enquire the molecular mechanisms underlying the physiological responses to insect cells. Advances in Insect body structure has instituted a dedication to the ebook of top quality studies on molecular biology and molecular genetics in components the place they supply an elevated knowing of physiological procedures in bugs. quantity 24 is the 1st to incorporate such particularly sought articles.
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1989). Such structural FIG. 4 Lineage of the mesothoracic G-neurone and its segmental homologues ( B l , B2) in the metathoracic and the first abdominal ganglion. (A) Pattern of neuronal precursors (61 neuroblasts; 30 NBs per hemiganglion, arranged in seven rows, and a single median NB (MNB) for a single segment. (B) The G-neuron arises from NB 7-4 (drawn in black). The G-cell homologues develop from a twin of a ganglion mother cell arising from neuroblast 7-4 in the appropriate ganglion. (C) Camera lucida drawings of the G, B1 and B2 neurone in adult Locusta migratoria; the Gneurone is located in the mesothoracic ganglion, the B1-neurone is located in the metathoracic neuromere, and the BZneurone is located mainly in the first abdominal neuromer, which is fused with the metathoracic neuromere in adult locusts.
This means that serially homologous neurones contact serially homologous postsynaptic cells. Such contacts are a prerequisite for a proper outgrowth of the respective neurones. , 1982). , 1984). , 1976). Even structurally rather similar neurones, such as serotonin immunoreactive intraganglionic neurones (see below), maintain their complex similar dendritic arborization patterns in the metamorphosing meal beetle as a result of stereotyped cell-cell interactions (Breidbach, 1987d). Therefore, it is not surprising that structural variation of serial homologues is limited in most cases (Wilson and Hoyle, 1978; Burrows and Siegler, 1984; Burrows and Watkins, 1986), and it is independent of different functional surroundings.
Cell migration, pathfinding and expression of a specific membrane molecule, seen in parallel for all segments, are additional hints for serially homologous structures and physiological processes. Furthermore, the tympana1 organ of noctuids can be homologized with the locust metathoracic chordotonal organ at the wing base (Yack and Fullard, 1990; see original statement, Wilson and Gettrup, 1963). , 1991), also based on embryonic studies of a locust, demonstrated a serial homology of a specific nerve and its associated sense organs.