The cat; an introduction to the study of backboned animals, especially mammals (1881) (19965747043)

Title: The cat; an introduction to the study of backboned animals, especially mammals

Identifier: catintroductiont00miva (find matches)

Year: 1881 (1880s)

Authors: Mivart, St. George Jackson, 1827-1900

Subjects: Cats; Anatomy, Comparative

Publisher: London, Murray

Contributing Library: MBLWHOI Library

Digitizing Sponsor: MBLWHOI Library

Text Appearing Before Image:

CHAP. X.) THE DEVELOPMENT OF THE CAT. 357 groove and tho approximation of the roof of the canalis centralis to the dorsal surface.

Text Appearing After Image:

Fig. 100.âDiAGRAii Of Beain' Development, to show the essential relations of its PAr.Ts. A. The hrain in its earliest oomlitinu of tliree liollow vesicles, the cavity of wliicli is coii- timidus with the wide cavity ('/) of the iwiiiiitive siiinal marrow (m). The brain suhstanee forms an envelo))eof nearly equal thickness tlironghout. The wall of the anterior end of the first vesicle is the lamina terminalis (t). B. Here the first Aesicle or fore-brain has de- veloped the iiineal gland (pn) above, and the pituitary body (pt) below, the cerebral lieinisphere (c/) are beginning to bud forth from the front ))art of the first vesicle. C. The cerebrum is here enlarged, and has begun to bud out into the olfactoiy lobes (o). The cavity of the ceieljrum (or incipient lateral ventiiele) communicating with that of the olfactory lobe in front, and with that of the first cerebral vesicle (i.e., with the third ventricles) behind. The latter communica- tion takes place through the foranien of Monro (/<»). The walls of the three cerebral vesicles are becoming unef;ual in thickness, and the cavity of the niiildle vesicle (h) is becoming reduced in relative size, as the iter a terfio ail quartuni ventfiviiltiui. The thickened upper part of the cerebrum (/) is what is to become the fornix. The thickened roof of the middle vesicle has divided into the corjiora quadrigemina (oral lobe (tl). a. Fore-brain. ac. Anterior coruu. b. Mid-lirain. c. Hind-brain. ch. Cerebellum. ct: Cerebrum. f/o. Descending comu. d. Cavity of the medulla, /. Fornix. (/. Corpora quadrigemina. i. Iter a tertio ad quartum ventriculum. m. Medulla oVilongata. ma. C'or))ora mammillaria. 0. Olfactoi-y l<ibe. jic. Pons Varolii, 'pn. Pineal gland. pt. Pituitary iKidy. /â . Ciura cerebri. f. Lamina terminalis. tl. Temporal lobe of cerebrum. X. Space enclosed between the baokwardly- extended cerebrum and the much narrowed roof of the third ventiiele, which has now become the velum interpositum. 2. Lateral ventricle, ;i. Third ventricle, i. Fourth ventricle. The BRAIN is first indicated by the expansion of the pre-axial end of the medullary groove into what becomes the first or most anterior cerebral vesicle or fore-hrain. To this succeed two other

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