Template:Endocrine embryo table: Difference between revisions
From Embryology
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| [[Carnegie stage 15|'''Stage 15''']] | | [[Carnegie stage 15|'''Stage 15''']] | ||
* [[Endocrine - Pineal Development|Pineal]] - pineal body is detectable in the roof of the diencephalon (Stadium I of Turkewitsch<ref name=Turkewitsch1933>{{Ref-Turkewitsch1933}}</ref> | * [[Endocrine - Pineal Development|Pineal]] - pineal body is detectable in the roof of the diencephalon (Stadium I of Turkewitsch<ref name=Turkewitsch1933>{{Ref-Turkewitsch1933}}</ref><ref name=O'Rahilly1968>{{Ref-O'Rahilly1968}}</ref> | ||
* [[Endocrine - Thyroid Development|Thyroid]] - thyroid primordium may be detached from the pharyngeal epithelium in some instances. "At about the time" when the thyroglossal duct "becomes broken it loses its lumen".<ref name=Grosser1912>{{Ref-Grosser1912}}</ref> | * [[Endocrine - Thyroid Development|Thyroid]] - thyroid primordium may be detached from the pharyngeal epithelium in some instances. "At about the time" when the thyroglossal duct "becomes broken it loses its lumen".<ref name=Grosser1912>{{Ref-Grosser1912}}</ref> | ||
* [[Endocrine - Adrenal Development|Adrenal]] | * [[Endocrine - Adrenal Development|Adrenal]] | ||
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| [[Carnegie stage 16|'''Stage 16''']] (week 6) | | [[Carnegie stage 16|'''Stage 16''']] (week 6) | ||
* [[Endocrine - Pituitary Development|Pituitary]] - slight indication of the infundibular recess may be seen in some embryos.<ref name=O'Rahilly1973a>{{Ref-O'Rahilly1973a}}</ref> | * [[Endocrine - Pituitary Development|Pituitary]] - slight indication of the infundibular recess may be seen in some embryos.<ref name=O'Rahilly1973a>{{Ref-O'Rahilly1973a}}</ref> | ||
* [[Endocrine - Pineal Development|Pineal]] - cellular migration in an external direction occurs in the pineal body during stages 16 and 17 (Stadium 2 of Turkewitsch<ref name=Turkewitsch1933>{{Ref-Turkewitsch1933}}</ref> | * [[Endocrine - Pineal Development|Pineal]] - cellular migration in an external direction occurs in the pineal body during stages 16 and 17 (Stadium 2 of Turkewitsch<ref name=Turkewitsch1933>{{Ref-Turkewitsch1933}}</ref><ref name=O'Rahilly1968>{{Ref-O'Rahilly1968}}</ref> | ||
* Thymus - according to Norris (1938)<ref name=Norris1938>{{Ref-Norris1938}}</ref> , "not until the primordium of the parathyroid [3] has been outlined can the remaining portion of the third pouch be recognized, by exclusion, as the primordium of the endodermal thymus". | * Thymus - according to Norris (1938)<ref name=Norris1938>{{Ref-Norris1938}}</ref> , "not until the primordium of the parathyroid [3] has been outlined can the remaining portion of the third pouch be recognized, by exclusion, as the primordium of the endodermal thymus". | ||
* [[Endocrine - Parathyroid Development|Parathyroids]] - parathyrogenic zones are closely related to the third and fourth aortic arches at 9 mm unstaged embryo). <ref name=PolitzerHann1935>{{Ref-PolitzerHann1935}}</ref> Parathyroid 3 is identifiable on the anterior wall of the third pharyngeal pouch (Weller 1933, Fig. 17) and "does not arise from a dorsal lobule" of the pouch.<ref name=Norris1937>{{Ref-Norris1937}}</ref> The "sudden appearance of well-differentiated clear chief cells in the early primordia of the parathyroids" at 9 mm was emphasized by Norris (1937).<ref name=Norris1937>{{Ref-Norris1937}}</ref> | * [[Endocrine - Parathyroid Development|Parathyroids]] - parathyrogenic zones are closely related to the third and fourth aortic arches at 9 mm unstaged embryo). <ref name=PolitzerHann1935>{{Ref-PolitzerHann1935}}</ref> Parathyroid 3 is identifiable on the anterior wall of the third pharyngeal pouch (Weller 1933, Fig. 17) and "does not arise from a dorsal lobule" of the pouch.<ref name=Norris1937>{{Ref-Norris1937}}</ref> The "sudden appearance of well-differentiated clear chief cells in the early primordia of the parathyroids" at 9 mm was emphasized by Norris (1937).<ref name=Norris1937>{{Ref-Norris1937}}</ref> | ||
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| [[Carnegie stage 19|'''Stage 19''']] | | [[Carnegie stage 19|'''Stage 19''']] | ||
* [[Endocrine - Pituitary Development|Pituitary]] - the caudal part of the craniopharyngeal pouch is reduced to a closed epithelial stem.<ref name=Andersen1971>{{Ref-Andersen1971}}</ref> | * [[Endocrine - Pituitary Development|Pituitary]] - the caudal part of the craniopharyngeal pouch is reduced to a closed epithelial stem.<ref name=Andersen1971>{{Ref-Andersen1971}}</ref> | ||
* [[Endocrine - Pineal Development|Epiphysis]] - the "anterior lobe" of the pineal body shows a characteristic step and wedge appearance (Stadium 4 of Turkewitsch<ref name=Turkewitsch1933>{{Ref-Turkewitsch1933}}</ref>) | * [[Endocrine - Pineal Development|Epiphysis]] - the "anterior lobe" of the pineal body shows a characteristic step and wedge appearance (Stadium 4 of Turkewitsch<ref name=Turkewitsch1933>{{Ref-Turkewitsch1933}}</ref>)<ref name=O'Rahilly1968>{{Ref-O'Rahilly1968}}</ref> | ||
* [[Endocrine - Parathyroid Development|Parathyroids]] - 3 become detached from the pharyngeal endoderm.<ref name=Jirasek1980>{{Ref-Jirasek1980}}</ref> | * [[Endocrine - Parathyroid Development|Parathyroids]] - 3 become detached from the pharyngeal endoderm.<ref name=Jirasek1980>{{Ref-Jirasek1980}}</ref> | ||
* Adrenal Cortex - C2 cells lie on the surface of the gland and form a "capsule".<ref name=Crowder1957>{{Ref-Crowder1957}}</ref> | * Adrenal Cortex - C2 cells lie on the surface of the gland and form a "capsule".<ref name=Crowder1957>{{Ref-Crowder1957}}</ref> |
Revision as of 14:29, 1 November 2016
Human Embryonic Endocrine |
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Data based on data from O'Rahilly (1983).[1] |
Stage 13 (week 4)
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Stage 14 (week 5)
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Stage 15
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Stage 16 (week 6)
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Stage 17
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Stage 18 (week 7)
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Stage 19
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Stage 20 (week 8)
(1938), of migration of and covering by "cells derived from the cervical sinus".
Weller (1933, Fig. 23) showed parathyroid 3 still rostral to parathyroid 4 at 23 mm, whereas (presumably due to variation in the "descent" of the thymus) (Norris 1937, Fig. 4[17]) showed parathyroid 3 rostral to, level with, and caudal to parathyroid 4 in embryos of 16-17 mm. |
Stage 21
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Stage 22
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Stage 23
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References
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