. The development of the chick : an introduction to embryology. Embryology; Chickens -- Embryos. 426 THE DEVELOPMENT OF THE CHICK sions formed by the fusion of the distal ends of the first four true thoracal ribs; the fifth pair of thoracal ribs does not take part in the formation of the sternum. The sternum thus arises as two distinct halves, which lie at first in the wall of the thorax at the posterior end of the pericardial cavity (eight days). The greatest extension of the sternal primordia is dorso-ventral, the. Fig. 242. â Photograph of the skeleton of a 13-day chick embryo. Prepared by
. The development of the chick : an introduction to embryology. Embryology; Chickens -- Embryos. 426 THE DEVELOPMENT OF THE CHICK sions formed by the fusion of the distal ends of the first four true thoracal ribs; the fifth pair of thoracal ribs does not take part in the formation of the sternum. The sternum thus arises as two distinct halves, which lie at first in the wall of the thorax at the posterior end of the pericardial cavity (eight days). The greatest extension of the sternal primordia is dorso-ventral, the. Fig. 242. â Photograph of the skeleton of a 13-day chick embryo. Prepared by the potash method. â ^ (Preparation and photograph by Roy L. Moodie.) 1, Premaxilla. 2, Nasal. 3, lachrymal. 4, Para- sphenoid. 5, Frontal. 6, Squamosal. 7, Parietal. 8, Exoccipital. 9, Cervical rib. 10, Coracoid. 11, Scapula. 12, Humerus. 13, Ilium. 14, Ischium. 15, Pubis. 16, Metatarsus. 17, Tibiofibula. 18, Pala- tine. 19, Jugal. 20, Maxilla. 21, Clavicle. ventral extremities corresponding to the anterior end of the defini- tive sternum, which is formed by concrescence of the lateral halves in the middle line beginning at the anterior end. The concrescence. 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
