. The development of the chick; an introduction to embryology . A B Fig. 121.—A. Embryo of 3 ;ind 16 hours incubation. x 5. B. Emliryo of 5 days incubation, x 5. (After Keibel and Abra-ham.) and viscera. The development of nuiscles, bones, liinl)s. etc., thatdefine the form of the fowl, begins relatively late, and only gradu-ally conceals the outlines of the internal parts. Figs. 121 to 124 illustrate the devclo])ment of the external 211 212 THE DEVELOPMENT OF THE CHICK form tVom tliree days sixteen hours to ten days. In Fig. 121 A(three (hiys sixteen hours) the form of the head is define
. The development of the chick; an introduction to embryology . A B Fig. 121.—A. Embryo of 3 ;ind 16 hours incubation. x 5. B. Emliryo of 5 days incubation, x 5. (After Keibel and Abra-ham.) and viscera. The development of nuiscles, bones, liinl)s. etc., thatdefine the form of the fowl, begins relatively late, and only gradu-ally conceals the outlines of the internal parts. Figs. 121 to 124 illustrate the devclo])ment of the external 211 212 THE DEVELOPMENT OF THE CHICK form tVom tliree days sixteen hours to ten days. In Fig. 121 A(three (hiys sixteen hours) the form of the head is defined bythe brain, eyes, and visceral arclies. The cervical flexure isstrongly marked. Thei-e is no neck. The heart makes a largeprotuberance immediately beliind the head. The limb-buds arerounded swellings. In Fig. 121 B (five days one hour) the cer-vical flexure is less marked; the enlargement of the mid-brain
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Keywords: ., bookcentury1900, bookdecade1900, bookiddevelopm, booksubjectbirds
