Pathways and fine structure of neurons forming the nervi corporis allati II of the cockroach Periplaneta americana (L.).

By back-filling the nervus corporis allati II (NCA2) with Co2+ and precipitating the sulfide, two groups of somata (A and B) are revealed on the ipsilateral side of the subesophageal ganglion (SG). These occur anteroventrally, adjacent to the midsaggital plane. Group A consists of two cells; group B of five.

Locations and central projections of neurons associated with the retrocerebral neuroendocrine complex of the cockroach Periplaneta americana (L.).

Retrograde diffusion and precipitation of Co2+ reveals in the ipsilateral pars lateralis (PL) and contralateral pars intercerebralis (PI) of the brain neurons that enter the corpus cardiacum (CC), and, possibly, the corpus allatum (CA) on each side. The PL group consists of 29.6 +/- 8.