Archive image from page 174 of The anatomy, physiology, morphology and. The anatomy, physiology, morphology and development of the blow-fly (Calliphora erythrocephala.) A study in the comparative anatomy and morphology of insects; with plates and illustrations executed directly from the drawings of the author; CUbiodiversity4765349-9875 Year: 1890 ( THE DEVELOPMENT OE THE NERVOUS SYSTEM. 487 which is consistent with the developmental history and final condition of the Arthropod brain, and renders a great number of facts intelligible. I advance it with some diffidence, as I am aware of the dif
Archive image from page 174 of The anatomy, physiology, morphology and. The anatomy, physiology, morphology and development of the blow-fly (Calliphora erythrocephala.) A study in the comparative anatomy and morphology of insects; with plates and illustrations executed directly from the drawings of the author; CUbiodiversity4765349-9875 Year: 1890 ( THE DEVELOPMENT OE THE NERVOUS SYSTEM. 487 which is consistent with the developmental history and final condition of the Arthropod brain, and renders a great number of facts intelligible. I advance it with some diffidence, as I am aware of the difficulties which beset any investigation of the development of the nerve-centres, and the ease with which the significance of a layer of cells may be misinterpreted, but I present it as a working hypothesis which may serve as a guide to future investigators. The evidence in its favour depends on but few preparations, and is the result of the study of a single insect; the difficulties of obtaining satis- factory evidence is very great owing to the extreme rarity of good preparations in the earlier stages of the development of the larva in the proper planes for the investigation of the question, as suitable sections are by no means easy to prepare. In examining the nymphoid state of the embryo, I discovered Ku;. 64.—A sagittal section of the neuroblast of a newly-hatched larva. </, head discs; V, ventricular cavity of the hemisphere ; g, central stroma of the neuro- blast. a condition, which is figured in PI. XV., Fig. i, in which the preoral ganglia are apparently vesicular, and subsequently I found the observation borne out by the condition of the nerve- centres in the newly-hatched larva (Fig. 64). From these observations, I am strongly urged to the view that the remark- able mantle layer in the adult larva is the roof of a cavity, the remains of which form the ventricular cavities of the brain of the imago. It is true that the early vesicular stage, which appears to be
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