. The development of the chick; an introduction to embryology. Birds -- Embryology. >v;:-.'-i.. iW'NJi. Fig. 146. — Transverse section through the cervical swelling of the spinal cord of a 12-day chick. (After v. Kupffer.) C, Central canal, d. H., Dorsal horn of the gray matter. Ep., Ependyma. N. H., Nucleus of Hoffmann, s. d., Dorsal fissure, s. v., Ventral fissure, v. H., Ventral horn of the gray matter. The development of the so-called dorsal and ventral fissures is essentially different. The entire ventral longitudinal fissure of the cord owes its origin to growth of the ventral columns
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. The development of the chick; an introduction to embryology. Birds -- Embryology. >v;:-.'-i.. iW'NJi. Fig. 146. — Transverse section through the cervical swelling of the spinal cord of a 12-day chick. (After v. Kupffer.) C, Central canal, d. H., Dorsal horn of the gray matter. Ep., Ependyma. N. H., Nucleus of Hoffmann, s. d., Dorsal fissure, s. v., Ventral fissure, v. H., Ventral horn of the gray matter. The development of the so-called dorsal and ventral fissures is essentially different. The entire ventral longitudinal fissure of the cord owes its origin to growth of the ventral columns of gray and white matter which protrude below the level of the original floor (Figs. 145 and 146), and the latter is thus left be- tween the inner end of the fissure and the central canal. The dorsal longitudinal fissure on the other hand is for the most part. 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 work.. Lillie, Frank Rattray, 1870-1947. New York, Holt