File:Hand-book of physiology (1892) (14765113152).jpg

Identifier: handbookofphysio00bake (find matches)
Title: Hand-book of physiology
Year: 1892 (1890s)
Authors: Baker, W. Morrant, (William Morrant), 1839-1896 Harris, Vincent Dormer Kirkes, William Senhouse, 1823-1864. Hand-book of physiology. 13th ed
Subjects: Physiology Human physiology
Publisher: London : John Murray
Contributing Library: Francis A. Countway Library of Medicine
Digitizing Sponsor: Open Knowledge Commons and Harvard Medical School

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lprocess ; 4, superior maxillary process ; 5, eye; 6, inferior maxillary process, orfirst visceral arch, and below it the firstcleft; 7, 8, 9, second, third, and fourtharches and clefts, b. Anterior view of thehead of a human foetus of about the fifthweek (from Ecker, as before, fig. IV.).1, 2, 3, 5, the same parts as in a ; 4, theexternal nasal or lateral frontal process : 6, the superior maxillary process; 7, thelower jaw ; X, the tongue; 8, first bran-chial cleft becoming the meatus auditoriusexternus. 8i8 DEVELOPMENT. (CH. XIX. arch, the greater cornu and body of the hyoid bone. In man andother mammalia the fourth visceral arch is indistinct. It occupiesthe position where the neck is afterwards developed. A distinct connection is traceable between these visceral archesand certain cranial nerves : the trigeminal, the facial, the glosso-pharyngeal, and the vagus. The ophthalmic division of thetrigeminal supplies the fronto-nasal process; the superior and G.Ph VZT GttVjW-rr l*1 4F $F
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Fig. 487.—Embryo chick (4th day), viewed, as a transparent object, lying on its left side(magnified). G H, cerebral hemispheres ; F B, fore-brain or vesicle of third ventricle,■with Pn, pineal gland projecting from its summit; MB, mid-brain ; G b, cerebellum ; IV. V, fourth ventricle ; //, lens ; c h s, choroidal slit; Gen. V, auditory vesicle; s m,superior maxillary process ; iF, 2F, &c, first, second, third, and fourth visceral folds ; V, fifth nerve, sending one branch (ophthalmic) to the eye, and another to the firstvisceral arch ; VII, seventh nerve, passing to the second visceral arch ; G. Ph, glosso-pharyngeal nerve, passing to the third visceral arch ; P g, pneumogastric nerve, pass-ing towards the fourth visceral arch ; i v, investing mass; c h, notochord; its frontend cannot be seen in the living embryo, and it does not end as shown in the figurebut takes a sudden bend downwards, and then terminates in a point; Ht, heart seenthrough the walls of the chest; M P, muscl

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