File:A monograph on the development of elasmobranch fishes (1878) (14765000742).jpg

Identifier: monographondevel00balf (find matches)
Title: A monograph on the development of elasmobranch fishes
Year: 1878 (1870s)
Authors: Balfour, Francis M. (Francis Maitland), 1851-1882
Subjects: Fishes -- Embryology Chondrichthyes
Publisher: London :
Contributing Library: Harvard University, Museum of Comparative Zoology, Ernst Mayr Library
Digitizing Sponsor: Harvard University, Museum of Comparative Zoology, Ernst Mayr Library

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Fig. 9. F.M.Balfour T.P. Comrvgs. EXPLAXA.TIOX OF PLATE XIII.This Plate illustrates the Formation op the Spinal Nerves. Comj^lete list of reference letters. p r. posterior root of a spinal nerve.a r. anterior root of a spinal nerve. n. spinal nerve. spg. ganglion on posterior root of spinal nerve.com. commissure connecting the posterior roots of the spinal nerves.w. white matter of spinal cord. n.c. neural canal. y. point where the spinal cord became segmented off from the super-jacent ei)iblast. /. mesoblastic investment of spinal cord. m.p. muscle-plate.V. r. vertebral rudiment. ch. notochord. Fig. 1, 2, and 3. Three sections of a Pristiurus embryo belonging tostage I. Fig. 1 passes through the heart, fig. 2 through the anterior partof the dorsal region, fig. 3 through a point slightly behind this. (Zeiss CC,ocul. 2.) In fig. 3 there is visible a slight proliferation of cells from thedorsal summit of the neural canal. In fig. 2 this proliferation definitely con-stitutes two chib-sh

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