. The development of the chick; an introduction to embryology . ——•^-^^^SsSt-- ■■--■ ^.27 ■—i/?//:. ^/77. r^.^y^ -■, ... :^: L. .•^r^-rff !ili. v-iJiC—-L ii^L ■-■ ; Tv, ^^i Fig. 93.—Entire embryo of 27 s viewed as a transparent object from above. a. a. 1, a. a. 2, a. a. 3, First, second, and thirdaortic arches. Car., Carotid loop. Ret., C. 1, V. C. 2, First and second visceral abbreviations as before, x 20. 164 THE DEVELOPMENT OF THE CHICK formed, but they rapidly become well differentiated. IV. The Organs of Special Sense (Eye, Ear, Nose) Embryologically a s
. The development of the chick; an introduction to embryology . ——•^-^^^SsSt-- ■■--■ ^.27 ■—i/?//:. ^/77. r^.^y^ -■, ... :^: L. .•^r^-rff !ili. v-iJiC—-L ii^L ■-■ ; Tv, ^^i Fig. 93.—Entire embryo of 27 s viewed as a transparent object from above. a. a. 1, a. a. 2, a. a. 3, First, second, and thirdaortic arches. Car., Carotid loop. Ret., C. 1, V. C. 2, First and second visceral abbreviations as before, x 20. 164 THE DEVELOPMENT OF THE CHICK formed, but they rapidly become well differentiated. IV. The Organs of Special Sense (Eye, Ear, Nose) Embryologically a sharp distinction must be drawn betweenthe essential percipient part of the organs of sense (retina of theeye, olfactory epithelium, and epithelium of the membranous laby-rinth) and the parts formed for protection and for the elaborationof function. The sensory part proper is the first to arise in theembryo, and is protected later by modifications of surroundingtissues or parts. We may thus distinguish between primary andsecondary parts in the case of all organs of sense. Only the earlyhistory o
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Keywords: ., bookauthorlilliefrankrattray187, bookcentury1900, bookdecade1910
