. The development of the chick : an introduction to embryology. Embryology; Chickens -- Embryos. Mes. A Mi*,. Pig 36, _ a. Intermediate stage of the formation of the primitive streak of the sparrow. (After Sehauinsland.) B. Fully formed primitive streak of the spar- row. (After Sehauinsland.) a. o., Area opaca. a. p., Area pellucida. Ent. Th., Thickening of entoderm. Mes., Mesoderm, pr. f., Primitive fold. pr. gr., Primitive groove, pr. p., Primitive pit. pr. str., Primitive streak, s. gr., Sickle groove. At first the surface of the primitive streak is even, but, as it elongates, a groove
. The development of the chick : an introduction to embryology. Embryology; Chickens -- Embryos. Mes. A Mi*,. Pig 36, _ a. Intermediate stage of the formation of the primitive streak of the sparrow. (After Sehauinsland.) B. Fully formed primitive streak of the spar- row. (After Sehauinsland.) a. o., Area opaca. a. p., Area pellucida. Ent. Th., Thickening of entoderm. Mes., Mesoderm, pr. f., Primitive fold. pr. gr., Primitive groove, pr. p., Primitive pit. pr. str., Primitive streak, s. gr., Sickle groove. At first the surface of the primitive streak is even, but, as it elongates, a groove appears down its center. This groove is known as the primitive groove; it is bounded by the primitive folds and terminates abruptly in front in a pit, the primitive pit, which corresponds to the neurenteric canal of other verte-. 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
