. The development of the chick; an introduction to embryology. Birds -- Embryology. Ent. TJ). â prp. s.^r Fig. 36. â A. Intermediate stage of the formation of the primitive streak of the sparrow. (After Schaninsland.) B. Fully formed primitive streak of the spar- row. (After Schaninsland.) a. o., Area opaca. a. p., Area pellucida. Ent. Th., Thickenino; 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 elo
. The development of the chick; an introduction to embryology. Birds -- Embryology. Ent. TJ). â prp. s.^r Fig. 36. â A. Intermediate stage of the formation of the primitive streak of the sparrow. (After Schaninsland.) B. Fully formed primitive streak of the spar- row. (After Schaninsland.) a. o., Area opaca. a. p., Area pellucida. Ent. Th., Thickenino; 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 I known as the primitive groove; it is bounded by the primitive \folds and terminates abruptly in front in a pit, the primitiv^e (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, Holt
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