. The development of the chick; an introduction to embryology. Birds -- Embryology. 192 THE DEVELOPMENT OF THE CHICK and the angle of the body-cavity; it consists of two parts, viz., the primary tubule and the supplementary part. It never pos- sesses a continuous lumen, though there is often a cavity in the supplementary part, which opens into the body-cavity through the nephrostome (Fig. 112 B). The pronephros of the chick is a purely vestigial organ, of no apparent functional significance. Its development is accord- ingly highly variable, and it often happens that the right and left sides of
. The development of the chick; an introduction to embryology. Birds -- Embryology. 192 THE DEVELOPMENT OF THE CHICK and the angle of the body-cavity; it consists of two parts, viz., the primary tubule and the supplementary part. It never pos- sesses a continuous lumen, though there is often a cavity in the supplementary part, which opens into the body-cavity through the nephrostome (Fig. 112 B). The pronephros of the chick is a purely vestigial organ, of no apparent functional significance. Its development is accord- ingly highly variable, and it often happens that the right and left sides of the same embryo do not correspond. It is also of very short duration and is usually completely lost on the fourth day. The tubules in the fifth to the tenth somites, /Ms'cA fir'/?. /'/SJ 'A So' 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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