. The development of the chick; an introduction to embryology. Birds -- Embryology. THE SKELETON 421 Formation of Vertebral Articulations. In the course of develop- ment the intervertebral discs differentiate into a peripheral inter- vertebral ligament and a central suspensory ligament which at first contains remains of the notochord. There is a synovial cavity between the intervertebral and suspensory ligaments. This dif- ferentiation takes place by a process of loosening and resorption. Fig. 238.—Median sagittal section of the basis cranii and first three vertebral centra of an 8-day chick.
. The development of the chick; an introduction to embryology. Birds -- Embryology. THE SKELETON 421 Formation of Vertebral Articulations. In the course of develop- ment the intervertebral discs differentiate into a peripheral inter- vertebral ligament and a central suspensory ligament which at first contains remains of the notochord. There is a synovial cavity between the intervertebral and suspensory ligaments. This dif- ferentiation takes place by a process of loosening and resorption. Fig. 238.—Median sagittal section of the basis cranii and first three vertebral centra of an 8-day chick. B. C, Basi-cranial cartilage, iv. D. 1, 2, 3, 4, First, second, third, and fourth intervertebral discs. N. T., Floor of neural tube. s. n. b. 1, 2, First and second subnotochordal bars. V. C. 1, 2, 3, First, second, and third pleurocentra. of cells just external to the perichordal sheath (). The in- tervertebral ligament takes the form of paired, fibrous menisci, or, in other words, the intervertebral ligaments are incomplete around the bodies of the vertebrae dorsally and ventrally (Schwarck). Ossification is well advanced in the clavicles, long bones,. 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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