and Embryology Related to Craniopharyngiomas


Fig. 1.1

A sagittal tissue section of a 7th week embryo (HE stain, 10 × 10). The brain vesicle can be seen, and the base of the diencephalon thickens. Meanwhile, Rathke’s pouch grows into the incrassated diencephalon. A clear acidophilic stained demarcation is showed between them, which is considered to be the pia mater. (1) Diencephalon, (2) Rathke’s pouch, (3) stomodeal, (4) brain vesicle. Arrow: Pia mater


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Fig. 1.2

A sagittal tissue section of a 10th week embryo (HE stain, 10 × 20). The mesenchymal cell differentiates to cartilage cell and closes the stomodeum part of Rathke’s pouch. The anterior wall of Rathke’s pouch continues to grow and forms a cell mass (adenohypophysis primordium). Meanwhile, the posterior Rathke’s pouch remains as a tube-like structure with several layers of epithelial cells. An acidophilic stained demarcation can be seen between nervous tissue and Rathke’s pouch. (1) Adenohypophysis primordium, (2) Rathke’s pouch, (3) neurohypophysis, (4) mesenchymal cell, which is going to develop into the diaphragma sellae. Arrow: Pia mater



1.3 Embryonic Morphogenesis of Membrane Structures in the Sellar Region


The pia mater reportedly appears during early neural tube development from glioblasts. Both the arachnoid and the dura mater are differentiated from ectoderm mesenchymal cells. The arachnoid structure can be observed in the 10th week. As the approach of the anterior pituitary and posterior pituitary occurs during the 5th to 7th week of embryogenetic development, the pia mater and several layers of mesenchymal cells should separate Rathke’s pouch and brain tissue (Fig. 1.3). Thus, from the point of view of embryonic development, Rathke’s pouch is located in the outside of the pia mater.

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Fig. 1.3

A coronal tissue section of an 18th week fetus (Masson stain, 10 × 20). The collagenous fiber can be demonstrated as red and blue using Masson stain. The arachnoid covered outside of optic nerve can be seen. In the pituitary capsule, the pia mater, stained in red, can be seen. The posterior of Rathke’s pouch is atrophied as a single layer of epithelial cells. The intermediate lobe of the pituitary is forming. (1) Optic nerve, (2) neurohypophysis, (3) Rathke’s pouch, (4) adenohypophysis. Arrow: Pia mater

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Mar 25, 2020 | Posted by in NEUROSURGERY | Comments Off on and Embryology Related to Craniopharyngiomas
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