Archive image from page 173 of The development of the chick. The development of the chick : an introduction to embryology . developmentofchi02lill Year: 1936 154 THE DEVELOPMENT OF THE CHICK conspicuous thickening, the optic chiasma, which is continued as a ridge in the lateral ventral zones on each side (Fig. 86). The infundibulum follows just behind this, and constitutes a considerable pouch-shaped depression from which the saccus infundibuli grows out later. The posterior wall of this depression rises sharply and joins the thickened tuberculum posterms which is the end of the floor of the
Archive image from page 173 of The development of the chick. The development of the chick : an introduction to embryology . developmentofchi02lill Year: 1936 154 THE DEVELOPMENT OF THE CHICK conspicuous thickening, the optic chiasma, which is continued as a ridge in the lateral ventral zones on each side (Fig. 86). The infundibulum follows just behind this, and constitutes a considerable pouch-shaped depression from which the saccus infundibuli grows out later. The posterior wall of this depression rises sharply and joins the thickened tuberculum posterms which is the end of the floor of the diencephalon. The diencephalon is compressed laterally (Fig. 97); the dorsal zones are slightly thickened, indicating the future thalami optici. Fig. 88. — Optical longitudinal section of the head of an embryo of 39 s. Abbreviations as before. The anterior lobe of the hypophysis should be mentioned here, although it is not embryologically a part of the brain. It arises as a median tubular invagination of the ectoderm of the ventral sur- face of the head immediately in front of the oral plate at about the 20 s stage (Fig. 85), and grows rapidly inward in contact with the floor of the diencephalon. At about the 30 s stage its end reaches nearly to the infundibulum (Fig. 87). At first part of its wall is formed by the oral plate, and when this ruptures the effect is to shorten the apparent length of the hypophysis (Fig. 88). At about the 36 s stage its distal portion flattens laterally
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