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 . ain to the eye or, as is the case in the pineal organand the paired eyes, from the eye to the brain, there is no latter course, however, is most probable. In An</ui*, theparietal nerve first appears at 50 mm. embryo size and reachesits maximum of development between the 27 and 30 mm. ft/iifi//<i, the nerve is well developed at fourteen days and isat its max
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 . ain to the eye or, as is the case in the pineal organand the paired eyes, from the eye to the brain, there is no latter course, however, is most probable. In An</ui*, theparietal nerve first appears at 50 mm. embryo size and reachesits maximum of development between the 27 and 30 mm. ft/iifi//<i, the nerve is well developed at fourteen days and isat its maximum at twenty-four to twenty-six days. Betweenthe thirtieth and fortieth days it shows signs of and Martin;vi showed that the nerve comes into relationwith the ganglionic cells forming a prominence with the brain THE PINEAL BODY 129 roof. This Beraneck23 designated in 1892 as the noyau prominence thus described can be nothing else than theclosely set ganglia habenulae of the interbrain as shown byStudnicka384 in 1893 in Lacerta, by Klinckowstroem209 in 1894in Iguana, and by Leydig239 in 1896 in Lacena. The parietalnerve is made up of fine fibrils; it has a perineurium, a connec-. \ fur Fig. 67 The pineal eye of Varanus giganteus, according to Spencer, , parapineal organ; Npar., parapineal nerve; Bl., blood vessel. tive tissue, and glial sheaths. In Iguana it degenerates anddisappears in the adults, according to Klinckowstroem (94).209In some cases Spencer366 found the parietal nerve divided intotwo or three strands, for example, in Lacerta ocellata andVaranus giganteus. A similar splitting was found by Studnicka384in 1893 in Petromyzon. Klinckowstroem209 in Iguana recognizeda second parietal nerve which arose from the left habenular MEMOIR NO. 9 V 130 i I;KDERICK AND LI TIIKK r. WAKKKX ganglion niul passed close behind the first nerve to the parietaleye. The lens of the parietal eye is not uniform in its shape;it occurs in the foll
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