. The development of the chick : an introduction to embryology. Embryology; Chickens -- Embryos. EMBRYO AND EMBRYONIC MEMBRANES 213 portion of the first visceral cleft alone is visible as the external auditory meatus; the other visceral arches and clefts have prac- tically disappeared, excepting the mandibular arch, forming the lower jaw. The abdominal viscera begin to protrude. Feather germs have appeared in definite tracts. In the next stage. Fig. 123 (eight days), the contours of the body are decidedly bird-. FiG. 123. — Embryo of 8 days x 5. (After Keibel and Abraham.) like; the fore-limbs
. The development of the chick : an introduction to embryology. Embryology; Chickens -- Embryos. EMBRYO AND EMBRYONIC MEMBRANES 213 portion of the first visceral cleft alone is visible as the external auditory meatus; the other visceral arches and clefts have prac- tically disappeared, excepting the mandibular arch, forming the lower jaw. The abdominal viscera begin to protrude. Feather germs have appeared in definite tracts. In the next stage. Fig. 123 (eight days), the contours of the body are decidedly bird-. FiG. 123. — Embryo of 8 days x 5. (After Keibel and Abraham.) like; the fore-limbs are wing-like. The contours of the head are much smoother, and determined more by the development of the facial region and skull than by the brain. The protuber- ance of the ventral surface caused by the viscera is strongly marked. Fig. 124 finally shows a ten-day embryo. Head. The embryonic development of the head depends on the changes in three important classes of organs, together with. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Lillie, Frank Rattray, 1870-1947. New York : Henry Holt
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Keywords: ., bookauthorlilliefrankrat, bookcentury1900, booksubjectembryology
