Archive image from page 121 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 ( 448 THE NERVOUS SYSTEM. Even in the Crayfish the anterior or thalamic central gray matter exhibits a cavity which extends into the procerebrcn, giving it a vesicular character (Fig. 55, 2, x). Moreover, it is connected with a small and very remark
Archive image from page 121 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 ( 448 THE NERVOUS SYSTEM. Even in the Crayfish the anterior or thalamic central gray matter exhibits a cavity which extends into the procerebrcn, giving it a vesicular character (Fig. 55, 2, x). Moreover, it is connected with a small and very remarkable cavity (Fig. 55,2, q) which one is almost tempted to compare with the hypophysis of the vertebrate brain. I have at present been unable to in- vestigate this curious organ more fully, and I have seen nothing like it in any insect. The Supra-oesophageal Nerve Centres of the Cockroach'(Blatta Fig. 55.—/. A lateral section througli tlic base of the brain of a Crayfish {As/aai: Jluvialilis): o, olfactory ganglion ; c a\ (esophageal connective ; <-;-, crus ; /«, mesocerebron ; 0, optic peduncle ; //;, thalamon ; y, ascending fibres. 2. A more highly magnified section nearer the ventral surface of the ganglia : cl, procerebral vesicle ; .r, ascending fibres ; q, ventricular cavity. The anterior part of the ventricular cavity, containing a fan-shaped group of cells is seen between the two bundles of ascending fibres. The other references as in /. orientalis) closely resemble those of the Crustacea. The principal points of distinction are the smaller size of the thalamic lobes, the far greater development of the meso- cerebron and corpora fungiformia, and the transference of the origin of the optic peduncle to the mesocerebron. Only a small portion of it arises in Insects from the thalamic lobes ; but a bundle of fibres can, so far as I know, always be traced on the anterior surface of the optic peduncle into the thalamon. The procerebron, although still very obscure, is
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