. Human embryology and morphology. Embryology, Human; Morphology. THE BEAIN AND SPINAL CORD. 203 The Pituitary Body is formed from two elements (Fig. 167): (1) An epiblastic hollow bud from the stomodaeuni (Fig 22 p. 30). roof plate pineal optic, thalam. \. ~- "~\ -__^^ midbrain caudate nucleus ><^<^r5^fe™Jii^ corp. lam. terminalis olfact. lobe sulcus of Monro ,,','i^^/~~corp. mam. hypothalam. part 3rd vent, tuber ciner. '<\~notoch. neural part of pituitary buccal pituitary phar. Fig. 167.—A schematic figure to show the parts derived from the walls of the fore-brain. (A
. Human embryology and morphology. Embryology, Human; Morphology. THE BEAIN AND SPINAL CORD. 203 The Pituitary Body is formed from two elements (Fig. 167): (1) An epiblastic hollow bud from the stomodaeuni (Fig 22 p. 30). roof plate pineal optic, thalam. \. ~- "~\ -__^^ midbrain caudate nucleus ><^<^r5^fe™Jii^ corp. lam. terminalis olfact. lobe sulcus of Monro ,,','i^^/~~corp. mam. hypothalam. part 3rd vent, tuber ciner. '<\~notoch. neural part of pituitary buccal pituitary phar. Fig. 167.—A schematic figure to show the parts derived from the walls of the fore-brain. (After His.) (2) A neuroblastic bud from the floor plate of the 3rd ven- tricle (fore-brain). The union of the two processes takes place at the anterior extremity of the notochord. The epiblast of the stomodaeum and the floor of the neural tube are in contact from the very beginning ; subsequently the mesoblast grows in between the fore- brain and the epiblast of the stomodaeum, but the parts which form the pituitary adhere. The posterior or neuroblastic bud becomes solid; its structure is that of neuroglia into which many vessels have grown carrying mesoblastic tissue with them. The anterior or stomodaeal bud embraces the posterior. While its posterior wall remains quiescent, its anterior throws out solid processes between which a network of vessels lies. This forms the glandular part of the pituitary—reticulated rows of cells surrounding blood channels—similar in structure to the medullary part of the supra-renals, carotid bodies and parathyroids. The trabeculae cranii form round the pituitary. When the basi- and. 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 Keith, Arthur, Sir, 1866-1955. London : E. Arnold
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