File:Streeter1957 plate02.jpg

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Plate 2. Photographs showing the Histology of the Hypophysis

In embryos belonging to horizon xxiii.

The epithelium of the anterior lobe has become partly subdivided into lobule which project into the mesodermal component of the gland. The abundant vascular elements are well shown in figure 21.

Fig. 19. Stage 23 No. 4289. 39-3-3. x200

Fig. 20. Stage 23 No. 4570. 62-1-3 x400

Fig. 21. Stage 23 No. 4289. 39-3-3 x800

Links: Endocrine - Pituitary Development | Carnegie stage 23

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Pages where the terms "Historic" (textbooks, papers, people, recommendations) appear on this site, and sections within pages where this disclaimer appears, indicate that the content and scientific understanding are specific to the time of publication. This means that while some scientific descriptions are still accurate, the terminology and interpretation of the developmental mechanisms reflect the understanding at the time of original publication and those of the preceding periods, these terms, interpretations and recommendations may not reflect our current scientific understanding.     (More? Embryology History | Historic Embryology Papers)
Links: 1 Graph Embryos 11-23 | 4 Eye and optic nerve 19-23 | Plate 1 - Cornea | Plate 2 - Hypophysis


Streeter GL. Developmental Horizons In Human Embryos Description Or Age Groups XIX, XX, XXI, XXII, And XXIII, Being The Fifth Issue Of A Survey Of The Carnegie Collection. (1957) Carnegie Instn. Wash. Publ. 611, Contrib. Embryol., 36: 167-196.

Cite this page: Hill, M.A. (2024, April 24) Embryology Streeter1957 plate02.jpg. Retrieved from

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