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 . l of the parapineal vesicle forms the truelens of the parietal eye, the ventral wall is pigmented and givesrise to the retina. The latter consists of layers of differenttypes of cells. In the embryonic stages it is attached to thebrain by a tubular prolongation from the roof-plate. The firstdetailed description of the parietal or third eye in reptiles wasgiven by deGraaf155 in 188
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 . l of the parapineal vesicle forms the truelens of the parietal eye, the ventral wall is pigmented and givesrise to the retina. The latter consists of layers of differenttypes of cells. In the embryonic stages it is attached to thebrain by a tubular prolongation from the roof-plate. The firstdetailed description of the parietal or third eye in reptiles wasgiven by deGraaf155 in 1886. Spencers366 work appeared inthe same year, and a number of investigations have been reportedsince then confirming in a general way the conclusions of these 120 FKKDKHirK TILXKV AND U THER F. early worker-. These researches include those of Beranock(87)- in AtHjuix and Lncertn; Franc-otto (S7)127 in AtKjni*;McKay (88)->; in Grammatophora and Hinnlid; Strahl andMartin (88)383 in Lucnia, and Hitter (91)332 in Phnjin^ is a general agreement regarding the histological structureof the retina among saiirians, and the following layers havebeen identified by most of the investigators mentioned:. Fi><;. ••) The structure of the retina in the pineal eye in Sphcnodon punrtatumaccordiiiK to Spencer, 1886. 1. Aii inner layer of long, cylindrical cells, called the rods orrod-like bodies of Spencer366 or the cellule* (xilonncts of In these cells pigment occurs. _. An inner layer of cells, called thecouche cellulaire interneby This consists of round cells with a large roundnuclei. Ritler-1- distinguishes 1\vo types of nuclei in this layer,najnol}r, those which are round and small and those which areoval and long. THE PINEAL BODY 127 3. A molecular layer described by Spencer366 and Francotte127or a layer of nerve fibers described by Strahl and latter observers and Klinckowstroem206 maintain that thesefibers are in conn
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