File:A monograph on the development of elasmobranch fishes (1878) (14578866197).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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d. Tiie rudiment of the ganglion (sp. g.) on the posterior root hasappeared, and the junction of posterior root with the cord is diflScult todetect. The anterior root forms an elongated cellular structure. Fig. 6. Section through the dorsal region of a Pristiurus embryo ofstage K. (Zeiss CC, ocul. 2.) The section especially illustrates the attach-ment of the posterior root to the spinal cord. Fig. 7. Section through the same embryo as fig. 6. (Zeiss CC, ocul. 1.)The section contains an anterior root, which takes its origin at a pointopposite the interval between two posterior roots. Fig. 8. A series of posterior roots with their central ends united by adorsal commissure, from a longitudinal and vertical section of a Scylliumembryo belonging to a stage intermediate between L and M. The embryowas hardened in a mixture of osmic and chromic acids. Fig. 9. The central end of a posterior nerve-root from tlie same embryo,with the commissure springing out from it on either side. KlV TloU XIV.
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EXPLANATION OF PLATE XIV.The Head during stages G—K. Complete list of r^erences. € p. external epiblast. op. eye. op. v. optic vesicle. op. n. optic nerve. I. lens. Ch. choroid slit. hi/, hyaloid membrane. ol. olfactory pit. au. v. auditory vesicle. au. n. auditory nerve. aa. p. auditory pit. au. thickening of epiblast to form the auditory pit. / h. fore-brain. cer. cerebrum. pn. pineal gland. p>t. pituitary body. In. iufimdibulum. in h. mid-brain. h b. base of brain. b. wall of brain. h b. hind-brain. cb. cerebellum. iv. v. fourth ventricla sp. c. spinal cord. v. fifth nerve. ojyth. v. ophthalmic branch of fifth. mn. v. mandi-bular branch of fifth, vii. seventh or facial nerve. gl. glossopharyngealnerve. com. commissure connecting roots of vagus nerve. Vg. vagus. 7>. posterior root of spinal nerve. 1, 2 etc. pp. first, second, etc. section of body cavity in the head. ch. notochord. m. mesoblast at the base of the brain. ht. heart. V. c. visceral cleft. 1, 2, 3 etc. e.g. ext

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