Michels. Nervensystem von Oryctes nasicornis im Larven—, Puppen—, und Käferzustande. Zeits. f. wiss. Zool., Bd. XXXIV. (1881).
Dietl. Organisation des Arthropodengehirns. Zeits. f. wiss. Zool., Bd. XXVII. (1876).
Flögel. Bau des Gehirns der verschiedenen Insektenordnungen. Zeits. f. wiss. Zool., Bd. XXX. Sup. (1878).
Newton. On the Brain of the Cockroach. Q. J. Micr. Sci. (1879). Journ. Quekett Club (1879).
Grenacher. Sehorgan der Arthropoden. (1879). [Origin, Structure, and Action of the Compound Eye.]
Carriere. Sehorgane der Thiere, vergl.-anat. dargestellt (1885). [Comparative Structure of various Simple and Compound Eyes.]
General Anatomy of Nervous Centres.
The nervous system of the Cockroach comprises ganglia and connectives,[100] which extend throughout the body. We have first, a supra-œsophageal ganglion, or brain, a sub-œsophageal ganglion, and connectives which complete the œsophageal ring. All these lie in the head; behind them, and extending through the thorax and abdomen, is a gangliated cord, with double connectives. The normal arrangement of the ganglia in Annulosa, one to each somite, becomes more or less modified in Insects by coalescence or suppression, and we find only eleven ganglia in the Cockroach—viz., two cephalic, three thoracic, and six abdominal.