. A text-book of embryology for students of medicine [electronic resource]. Embryology; Embryology. THE AXIAL SKELETON. 377 chymatous sheath of the chorda on the caudal side of the hypochordal brace. The intervertebral ligament is developed from the perichordal tissue on the dorsal side of the hypo- chordal brace. Bardeen's primitive disk includes this anlage of the intervertebral ligament plus the hypochordal brace of Froriep, which latter Eardeen regards as a transitory thick- ening of the ventral edge of the Hypochordal brace Fig. 176.—Cross-section through the anlage of the third ce
. A text-book of embryology for students of medicine [electronic resource]. Embryology; Embryology. THE AXIAL SKELETON. 377 chymatous sheath of the chorda on the caudal side of the hypochordal brace. The intervertebral ligament is developed from the perichordal tissue on the dorsal side of the hypo- chordal brace. Bardeen's primitive disk includes this anlage of the intervertebral ligament plus the hypochordal brace of Froriep, which latter Eardeen regards as a transitory thick- ening of the ventral edge of the Hypochordal brace Fig. 176.—Cross-section through the anlage of the third cervical vertebra of a cow embryo of 12 mm. in.) (Bonnet). The Cartilaginous Stage.—This stage of the develop- ment of the spine is brought about by the metamorphosis of parts of the membranous vertebral column into the car- tilaginous vertebrae. Other and alternating parts of the same structure furnish the intervertebral disks and the ligaments that bind together the individual elements of the spine. The histological changes necessary to effect the transformation of the embryonal connective tissue into cartilage are, briefly, the moving apart of the cells and the modification of both the cells and the intercellular substance, the latter acquiring the characteristic qualities of the matrix of cartilage. For each vertebral body there are two centers of chondri- fication, one on each side of the chorda within the mass of tissue referred to above (Fig. 176). The formation of car- tilage begins in the second month. The two centers are soon connected with each other by a third, which lies on the ventral side of the chorda, the three forming now a cartilaginous half-. 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 Heisler, John Clement; Waterstone, David, former owner; Duke-Elder, Stewart, 1898-1978, former own
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