. The development of the chick; an introduction to embryology. Birds -- Embryology. / Bl Fig. 163. — Outlines of .sections in the planes a, b, c, e, of Fig. 163. (After Bernd.) bl. v., Blood vessel, i. 1., Inner or retinal layer of the optic cup. o. 1., Outer or pigment layer of the optic cup. P. inv., Angle of invagination of the pecten. Other ab- breviations as before. (Fig. 162.) optic stalk betw^een the internal limiting membrane and the neu- roblast layer (ganglion cell layer), thus forming a superficial layer of axones; their formation begins on the fourth day, and there is a period abou
. The development of the chick; an introduction to embryology. Birds -- Embryology. / Bl Fig. 163. — Outlines of .sections in the planes a, b, c, e, of Fig. 163. (After Bernd.) bl. v., Blood vessel, i. 1., Inner or retinal layer of the optic cup. o. 1., Outer or pigment layer of the optic cup. P. inv., Angle of invagination of the pecten. Other ab- breviations as before. (Fig. 162.) optic stalk betw^een the internal limiting membrane and the neu- roblast layer (ganglion cell layer), thus forming a superficial layer of axones; their formation begins on the fourth day, and there is a period about the end of this day when axones are found in the distal part of the optic stalk, next to the bulbus oculi, but not in the proximal part, next to the brain. This observation affords conclusive proof of the retinal origin of the fibers of the optic. 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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