File:A monograph on the development of elasmobranch fishes (1878) (14765002232).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

View Book Page: Book Viewer
About This Book: Catalog Entry
View All Images: All Images From Book
Click here to view book online to see this illustration in context in a browseable online version of this book.

Text Appearing Before Image:
and 15 &. Two longitudinal and vertical sections throughthe head of a Pristiurus embryo belonging to stage K. Zeiss a, ocul. 3. Fig. 15 a is the most superficial section of the two. It shews the con-stitution of the seventh and fifth nerves, and of the intestinal branch of thevagus. The anterior branch of the seventh nerve deserves a special notice. Fig. 15 b mainly illustrates the dorsal commissure of the vagus nerve (com)continuous ^vith the dorsal commissures of the posterior root of the spinalnerves. Fig. 16. Two longitudinal and vertical sections of the head of aPristiurus embryo belonging to the end of stage K. Zeiss a, ocul. 1. Fig. 16 « passes through the median line of the brain and shews theinfundibiilum, notochord and pituitary body, etc. The pituitary body still opens into the mouth, though the septumbetween the mouth and the throat is broken through. Fig. 16 & is a more superficial section shelving the head cavities p)P Ij 2,3, and the lower vagus commissm-e. XV
Text Appearing After Image:
EXPLAXATIOX OF PLATE XV. Complete list of references. cer. cerebral hemispheres. ch. notoehord. IV. lateral ventricle. p cl. posterior cliuoid. jjn. pineal gland. mn, mandible. X. rudiment of septum which will grow backwards and divide theunpaired cerebral rudiment into the two hemispheres.cin. internal carotid. op.n. optic nerve. ojj. eye. in. infundibulum. /^^. pituitary body. ol. olfactory pit, ol. I. olfactory lobe. ojy. th. optic thalamus. p c. posterior commissure. m h. mid-brain, or optic lobes. ch. cerebellum. md. medulla oblongata. iv. v. fourth ventricle. /^. fasciculi teretes. r t. restiform tracts. t c. tela vasculosa of the roof of the fourth ventricle.au. V. auditory vesicle. vii. seventh nerve. Fig. la, 1 b, 1 c. Longitudinal sections of the brain of a Scylliumembryo belonging to stage L. Zeiss a, ocul. 1. la is taken slightly to one side of the middle line, and shews thegeneral features of the brain, and more especially the infundibulum (in.)and pituitary body (j^t). 1

Note About Images