Ventilation Motor Mechanisms in the Dragonfly and Other Insects
Ventilation in arthropods is achieved in one of two ways. Either movements of the gills or other appendages produce the ventilatory current, or movements of parts of the body wall produce volume and thus pressure changes in the body, and such changes in pressure produce the ventilatory current. It is this latter mechanism which will be considered here. In insects with an open tracheal system, these movements result in air passing in and out of the spiracles, while in the aquatic larvae of anisopteran dragonflies, which have a closed tracheal system and gills enclosed in a modified region of the hindgut, they result in water passing in and out of the rectum (Mill, 1972, 1974).
KeywordsMedian Nerve Abdominal Segment Excitatory Input Segmental Nerve Expiratory Muscle
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