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 . nd later acquires a lumen. Cameron1 showed in thechick that the epiphyseal anlage is a double outgrowth, the leftbeing the larger. These two evaginations ultimately the same condition is observed in amphibia. (lar-jano1 makes the observation which in the main covers the con-ditions observed in birds, namely, that as compared with thelower vertebrates the pinea
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 . nd later acquires a lumen. Cameron1 showed in thechick that the epiphyseal anlage is a double outgrowth, the leftbeing the larger. These two evaginations ultimately the same condition is observed in amphibia. (lar-jano1 makes the observation which in the main covers the con-ditions observed in birds, namely, that as compared with thelower vertebrates the pineal body is a profoundly altered organin bird- and mammals. One M| the authors in a recent work on the diencephalon re-produces illustrations of reconstruction models which show thedevelopment in the pineal region of <!<il!n* (jtillns. The first ... THE PINEAL BODY 69 evidence of <the epiphyseal complex in the chick makes its appear-ance at five days and twenty hours as a sprout from the caudalextremity of the interbrain roof-plate. This sprout contains anarrow canal and at this very early period shows an apparentdifferentiation into an expanded distal portion, a stalk, and anexpanded proximal Fig. 36 Mesial view of forebrain reconstruction of chick of 5 days and 20hours. X 100. The unshaded area shows the cut surfaces of the reconstruction,according to Tilney, 1915. 2, chiasmatic process; 4, chiasm; 7, epiphysis; 13, infundibular process; 20,lamina terminalis; 25, mammillary region; 32, post-chiasmatic eminence; 33, post-chiasmatic recess; 36, post-infundibular eminence; 38, pre-optic recess; 39, para-physis; 41, supra-optic crest; 42, supra-optic recess; 44, telencephalon; 45, tuber-culum postero-superius; 46, tubercle of the floor of Schulte. iO FREDERICK TILXEY AND LUTHER F. WARREN At this time the pineal region presents a well-marked para-physis, a velum transversum, and a dorsal sac. At the stage ofeight days in the chick a marked change is noticed, for a
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Keywords: ., bookcentury1900, bookdecade1910, bookpublisherphila, bookyear1919
