Abstract
Primary sensory projections and arborisations of higher-order neurons
associated with the maxillary palps were examined in Tettigoniidae,
Gryllidae. Tetrigidae and Acrididae representing the two sub-orders of
Orthoptera, Ensifera and Caelifera. Anterograde: filling and Golgi
impregnation of maxillary receptor neurons revealed two patterns of
innervation, the ensiferous and the caeliferous type. In both ensiferans
and caeliferans, receptor neurons arborised within the tritocerebrum,
the antennal motor- and mechano-sensory centre and the lobus
glomerulatus. In ensiferans, additional areas of innervation a ere found
in the lobus glomerulatus and in a preciously undescribed neuropil. here
referred to as the accessory Lobus glomerulatus. In relation to the
anatomical data a putative functional segregation of the neuropil into
gustatory-, olfactory- and mechano-sensory centres is implied. (C) 2001
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