[Type II neurons in the trunk of the cockroach Periplaneta americana].

Staining the nervous system by methylene blue, studies have been made on the topography and structure of type II neurones in the trunk of the cockroach. Small quantity of cells innervating various tissues was found together with 3 varieties of neurones, located near the nervous trunks, as well as 4 pairs of the abdominal stretch receptors (one pair of unicellular and one pair of bicellular receptors in tergites and sternites).