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 . Hm Fig. 31 The epiphyseal complex in an old embryo of Chelydra serpentina,according to Humphrey, 1894. Pf., paraphysis; V., velum transversum; Ds., dorsal sac; Ep., pineal organ; Cp.,posterior commissure. Fig. 32 The pineal region in an old embryo of Caiman niger, according toVoeltzkow, 1903. Hm., hemisphere; Pf., paraphysis; Ds., dorsal sac; Ch., commissura habenu-laris; M, midbr
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 . Hm Fig. 31 The epiphyseal complex in an old embryo of Chelydra serpentina,according to Humphrey, 1894. Pf., paraphysis; V., velum transversum; Ds., dorsal sac; Ep., pineal organ; Cp.,posterior commissure. Fig. 32 The pineal region in an old embryo of Caiman niger, according toVoeltzkow, 1903. Hm., hemisphere; Pf., paraphysis; Ds., dorsal sac; Ch., commissura habenu-laris; M, midbrain. 65 MEMOIR NO. 9 66 KHKDKHICK TIIAKV AND UTHKR F. WAHRKX marked paraphyseal evagination, a velum transversum, a dorsalsac, a commissTira habenularis, and a single thick-walled anlage ofthe pineal body whose apex is directed cephalad. The mostcaudal structure in the pineal region is the posterior commissure. Pf. l\£. •>•• Keconst met inn :!() mm. embryo of Thalassoc-liclys , l:iinin:i tciiiiinalis; //., parajiliysis; I., velum t raiisvcrsum; Ds., dorsalsac; fti., CMniiinissiira lialicnularis; !., cpiphysis; Cp., posterior commissure; Kat like pocket THE PINEAL BODY 67 . The development of the epiphyseal complex in aves In birds, the anlage of the epiphyseal complex makes its firstappearance as a simple and single evagination. This was firstobserved and described by Reissner329 in 1851 and called byReichert326 in 1859 the recessus pinealis. Lieberkiihn242 in 1871identified this evagination in birds as the anlage of the epiphysis. In many instances the presence of a double evagination ofthe roof-plate has been reported in the anlage of the epiphysisin birds. Saint Remy340 in 1897 found on either side of the stillunclosed neural tube a small evagination in the region of the
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