By P. D. Evans
Insect body structure is presently present process a revolution with the elevated program of molecular organic ideas to enquire the molecular mechanisms underlying the physiological responses to insect cells. Advances in Insect body structure has instituted a dedication to the booklet of top of the range experiences on molecular biology and molecular genetics in components the place they supply an elevated knowing of physiological strategies in bugs. quantity 24 is the 1st to incorporate such particularly sought articles.
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Homologous MNs are also observed in a flightless grasshopper (Arbas, 1983b). In these creatures the DLMs degenerate in the pterothorax (Arbas, 1983a); leaving innervation and presynaptic structures along inappropriate targets (Arbas and Tolbert, 1986). With respect to the migratory locust the relevant homologous MNs occupy an equivalent position, though the soma sizes and probably also the dendritic fields, are reduced in the flightless grasshopper. , 1982). (A rather similar structure is apparent within each group (acridid vs.
5 Ascending neurones in the terminal ganglia of different Orthoptera; camera lucida drawings of the ganglia, wholemounts, seen from dorsal. (A) Locustu migruforiu, fibres leave the ganglion via the dorsal median (DMT) and the lateral dorsal tract (LDT), the abdominal neuromers 8-1 1 are indicated (8-1 1). Asterix points to a non-giant cell of the ventral median cell body group (VMCBG) of the 8th neuromer, which is a putative homologue of the giant interneurones 1, 2, 3 and 4, respectively (1-4).
1981). In consequence, it is suggested that similar serially homologous neurones in the adult stage are the result of serial homologous developmental steps, based on repetitive cell-cell interactions. If such programmes are stereotyped then it is not surprising, that serially homologous neurones are rather similar in different segments, even though they may perform different functions due to additional processes (Breidbach and Kutsch, 1990). Some examples are given for the DUM-cells and for ascending and descending neurones in various species (Braunig, 1988; Pfliiger and Watson, 1988; Ronacher, 1990; Breidbach, 1991).