. The Journal of comparative neurology and psychology. Fig. 13. Squalus ac, 39 somites, froutal section through the anterior headcavities, showing their relation to the premaudibular somite (left side) andthe mesectoderm derived from the terminal neural crest. The connectionbetween n. thalamicus and terminal neural crest shows on the right 150. The relations of the anterior head cavities to somite 1 and to themesectoderm remain essentially unchanged up to embryos of 50somites. Figs. 12, 11, 13, 14 show these relations in frontal sec-tions of embryos with 29, 30 and 39 somites. The brain
. The Journal of comparative neurology and psychology. Fig. 13. Squalus ac, 39 somites, froutal section through the anterior headcavities, showing their relation to the premaudibular somite (left side) andthe mesectoderm derived from the terminal neural crest. The connectionbetween n. thalamicus and terminal neural crest shows on the right 150. The relations of the anterior head cavities to somite 1 and to themesectoderm remain essentially unchanged up to embryos of 50somites. Figs. 12, 11, 13, 14 show these relations in frontal sec-tions of embryos with 29, 30 and 39 somites. The brain, mesodermand mesectoderm with the cranial ganglia have been modelled in anembryo with 42 somites and Fig. 15 shows these relations as seen inthe model. 4/8 Journal of Comparative Neurology and ni ec Fig. 14. Section from same series as Fig. 13, passing tbrougli tlie tip of theanterior head cavity on the left side and in front of this cavity on the rightside. X 150.
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Keywords: ., bookauthorwistarinstituteofanat, bookcentury1900, bookdecade1900
