. The development of the chick; an introduction to embryology . M. T I { ■• / ^ ^7 \ ^ % VCJ ^ V20Jr \ 4% % ^ % ^* -•7 X •7 /^■j^ Fig. 150. — Lateral sagittal section of an cmhryo of S days. Rijiht side ofthe N. Neck of the allantois. Cbl., eerebelluni. Cr., Crop. E. T., Egg THE NER^OUS SYSTEM 251 short spur runs forward, a still shorter one ventrally, and thelongest arm extends backwards, gradually fading out beyondthe middle of the diencephalon. This fissure is not a continuationof the sulcus Monroi, or back^vard prolongation of the foramenof Monro, but is, on t
. The development of the chick; an introduction to embryology . M. T I { ■• / ^ ^7 \ ^ % VCJ ^ V20Jr \ 4% % ^ % ^* -•7 X •7 /^■j^ Fig. 150. — Lateral sagittal section of an cmhryo of S days. Rijiht side ofthe N. Neck of the allantois. Cbl., eerebelluni. Cr., Crop. E. T., Egg THE NER^OUS SYSTEM 251 short spur runs forward, a still shorter one ventrally, and thelongest arm extends backwards, gradually fading out beyondthe middle of the diencephalon. This fissure is not a continuationof the sulcus Monroi, or back^vard prolongation of the foramenof Monro, but is, on the contrary, entirely independent. The lateral thickenings of the diencephalon constitute thethalami optici, each of which may be divided into epithalamic,mesothalamic, and hypothalamic subdivisions. In the chick ateight days there is a deep fissure between the epi- and meso-thalamic divisions (the thalamic fissure. Fig. 147). The substanceof the epithalamus forms the ganglion habenulae. The meso-thalamic and hypothalamic divisions are not clearly
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