The fat-body is in reality, as development shows, the irregular cellular wall of the cœlom, or perivisceral space. Through this space courses the blood, flowing in no defined vessels, but bathing all the walls and viscera. In other words, the fat-body is an aggregation of little-altered mesoblast-cells, excavated by the cœlom, the rest of the mesoblast having gone to form the muscular layers of the body-wall and of the digestive tube.
CHAPTER VI.
The Nervous System and Sense Organs.
SPECIAL REFERENCES.
Newport. Nervous System of Sphinx Ligustri. Phil. Trans. (1832–4). Todd’s Cyclopædia, Art. “Insecta” (1839).
Leydig. Vom Bau des Thierischen Körpers. Bd. I. (1864). Tafeln zur. vergl. Anat. Hft. I. (1864).
Brandt (E.) Various memoirs on the Nervous System of Insects in Horæ Soc. Entom. Ross., Bd. XIV., XV. (1879).