. The development of the chick; an introduction to embryology. Birds -- Embryology. 416 THE DEVELOPMENT OF THE CHICK (caudal sclerotome halves) beneath the notochord is known as the subnotochordal bar (Froriep). It forms earlier than the remainder of the body of the vertebra and during the membranous stage is thicker, thus forming a ventral projection at the cephalic end of the vertebral body that is very conspicuous (Fig. 235). caut. Fig 234. — Frontal section including the same vertebral pn- mordia as Fig. 233, at a higher level through the neural arches, a C, Anterior commissure of the spin
. The development of the chick; an introduction to embryology. Birds -- Embryology. 416 THE DEVELOPMENT OF THE CHICK (caudal sclerotome halves) beneath the notochord is known as the subnotochordal bar (Froriep). It forms earlier than the remainder of the body of the vertebra and during the membranous stage is thicker, thus forming a ventral projection at the cephalic end of the vertebral body that is very conspicuous (Fig. 235). caut. Fig 234. — Frontal section including the same vertebral pn- mordia as Fig. 233, at a higher level through the neural arches, a C, Anterior commissure of the spinal cord, v R., Ven- tral root of spinal nerve. Other abbreviations as before (l^ig. 232). It chondrifies separately from the vertebral body and earlier. Except in the case of the first vertebra it fuses subsequently with the remainder of the vertebral body, and disappears as. 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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