The morphology and evolutional significance of the pineal body : being part I of a contribution to the study of the epiphysis cerebri with an interpretation of the morphological, physiological and clinical evidence . Kiii. •>(> Transverse sect ion t hroujili t lie end -vesicle of 1 lie pineal oruan in Leu-riscus riitilus, according to Ralil-Riickhanl, pineal or^ini; /////., lieiiiis|ilieres. IT), (ohm* ./V/. and Studnicka ClMi).386 Thepineal oru,;in in these sp(Hies is tubular. The distal (Mid forms alariie sac which lies beneath the skull. The pinealis
The morphology and evolutional significance of the pineal body : being part I of a contribution to the study of the epiphysis cerebri with an interpretation of the morphological, physiological and clinical evidence . Kiii. •>(> Transverse sect ion t hroujili t lie end -vesicle of 1 lie pineal oruan in Leu-riscus riitilus, according to Ralil-Riickhanl, pineal or^ini; /////., lieiiiis|ilieres. IT), (ohm* ./V/. and Studnicka ClMi).386 Thepineal oru,;in in these sp(Hies is tubular. The distal (Mid forms alariie sac which lies beneath the skull. The pinealis ispresent. THE PINEAL BODY 109 16. Belone acns. Studnicka (96).38i In this species there isa long, tubular stalk. Ependymal cells form the walls of thisstalk and have an arrangement reminiscent of the retinal sen-sory cells of the retina of Petromyzon especially of the region ofthe large end-vesicle (fig. 57). 17. Cyprhius carpio. Studnicka (96).383 The end-vesiclein this form is a circumscribed dilatation and has a thin, hollow. •- Hm Jlf Cp R Fig. 57 The epiphyseal complex in Belone acus, according to Studnicka, 1896. Ls., lamina terminalis; Pf., paraphysis; D., dorsal sac; Ch., commissura ha-benularis; R., proximal portion; Po., pineal organ; Cp., posterior commissure;M., midbrain. stalk, in the dorsal wall of which there courses the tractuspinealis. 18. Carassius auratus. Studnicka (96).386 The pineal organin this form is tubular throughout its entire extent. There is atractus pinealis as usual in the stalk, but no fossa in the skull. 19. Argyropelecus hemigymnus. Handrick (01).168 In theadult of this form both the pineal and parapineal organs appearto be present. The pineal organ has a thin stalk and a large 110 i I;I:DKI;ICK TILXEY AXD LUTHER F. WARREX end-vesicle which is much folded and highly vascular, beingmushroom in shape. This sac has much to suggest glandularactivity. Xo tract us i)inealis could be discovered in the end-vesicle lies beneath the roof
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