. The elements of Embryology. Embryology. VI.] THE PITUITARY BODY. 119 the pineal gland (Fig. 38, e), while the centre of the floor is produced into a funnel-shaped process, the infun- dibulum (Fig. 39, In), which, stretching tow^ards the Fig. 39. m7>. Longitudinal Section through the Brain of a young Pristiurus Embryo. cer. commencement of cerebral hemisphere; pi. pineal gland ; /w. iufundibuhim ; pt. ingrowth of mouth to form the pituitary body ; nib. mid-brain ; cb. cerebellum ; ch. noto- chord ; al. alimentary tract; laa. artery of mandibular arch. extreme end of the oral invagination o
. The elements of Embryology. Embryology. VI.] THE PITUITARY BODY. 119 the pineal gland (Fig. 38, e), while the centre of the floor is produced into a funnel-shaped process, the infun- dibulum (Fig. 39, In), which, stretching tow^ards the Fig. 39. m7>. Longitudinal Section through the Brain of a young Pristiurus Embryo. cer. commencement of cerebral hemisphere; pi. pineal gland ; /w. iufundibuhim ; pt. ingrowth of mouth to form the pituitary body ; nib. mid-brain ; cb. cerebellum ; ch. noto- chord ; al. alimentary tract; laa. artery of mandibular arch. extreme end of the oral invagination or stomodceum, joins a diverticulum of this which becomes the pituitary body. The development of the pituitary body or hypophysis cerebri has been the subject of considerable controversy amongst embryo- logists, and it is only within the last few years that its origin from the oral epithelium has been satisfactorily established. In the course of cranial flexure the epiblast on the under side of the head becomes tucked in between the blind end of the throat and the base of the brain. The part so tucked in constitutes a kind of bay, and forms the stomodseum or primitive buccal cavity already spoken of. The bhnd end of this bay becomes produced as a papilliform diverticulum which may be called the pituitary diverticulum. It is represented as it appears in a. 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 Foster, M. (Michael), Sir, 1836-1907. London, MacMillan
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Keywords: ., bookautho, bookcentury1800, bookdecade1880, booksubjectembryology
