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\£. •>•• 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 comple
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\£. •>•• 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. Fig. 34 The epiphyseal complex in an 8-day embryo of Anas domesticata,according to Hechscher, 1890. epiphyseal anlage. This observation was made upon Gallus,but Parker301 in 1892, in Apieryx, and Klinckowstroem206 in1892, in Larus, mentioned an evagination in front of the epi-physeal anlage. Hill181 in 1900 observed in a closed neural tubetwo such evaginations. Whether it is justified to consider theanlage of the epiphysis in birds as bilateral or double or whetherone of these evaginations represent the remnant of the para-pineal organ, is a difficult question to decide. By many thesereduplications in the anlage are considered as pathological sincethey occur only in isolated instances of the several speciesdescribed. The most common form in which the anlage in birds 68 FHHDKHKK TILXKY AM) LTTHKH F. WAIJKKX presents itself is a single evagination in front of the
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