Identifier: morphologyevolut00tiln Title: 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 Year: 1919 (1910s) Authors: Tilney, Frederick, 1875-1938 Warren, Luther Fiske, 1885- Subjects: Pineal gland Publisher: Philadelphia : The Wistar Institute of Anatomy and Biology Contributing Library: MBLWHOI Library Digitizing Sponsor: MBLWHOI Library

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Text Appearing Before Image: a fossa on the under surface of the skull. In sevenspecies, namely, Cobilis fossilis and barbatula, Lophius pisca-torius, Cyprinus carpio, Carassius auratus, Anarrhichas lupus,Pleuronectes platessa, and Clupea harengus, there is evidenceof a nervus pinealis or a tractus pinealis. All of these descrip-tions except one are given by Studnicka.386 This observer makesthe statement that there is no nervus pinealis in Ophidiumbarbatum. MEMOIR NO. 9 114 FREDERICK TILXEV AXD LUTHER F. WARREN 5. Comparative n/nl hixtolotji/ of the epiphyseal complex in tun /tliihid In aini)liil)i:i the pineal organ alone makes its appearance.In no other form is this organ so little developed. It presents asmall end-vesicle which Stieda7 first recognized and describedas the frontal xuhctihunoux (/land. This end-vesicle is attachedby means of a thread-like strand to a considerably expandedproximal portion, to which latter the name of epiphysis or corpuspineale has been ascribed. The pineal organ consists, there-

Text Appearing After Image: Fig. GO Head of Kana temporaria showing the unpaired pineal eye, situatedthe paired eyes, according to Stieda, 1865. fore, of the usual parts, namely, an end-vesicle, a stalk, and aproximal portion which is particularly conspicuous in amphibia,.The end-vesicle in so far as is known, is present in all formsexcept If i/l(i arborea, the absence in this form being noted bothby de( Iraat,1 and Leydig.-:is In shape, the end-vesicle is round.oval, or kidney-shaped. Stieda17 and dedraaf1 found it solid,containing a lumen only in Ijoinf>in<ilor. According to Stieda.its diameters ace from .12 to .1) mm. dedraaf found thesediameters in l\<in<t esculenta from .\2(\ to .14) mm., whileLessona-11 in the forms studied by him found that t lie diameterwas less than 1 mm. A number of observers, including Ostrou-moff2 (87); Lcydig^ (91) ; Galeotti140 (96), and Braem (US), THE PINEAL BODY 115 maintain that the frontal organ contains a cavity. Accordingto Leydig, this organ contains pigment in

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