File:Streeter1921 fig07-09.jpg

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Figures 7, 8. and 9. Three stages in the formation of the sagittal plexus

Three stages in the formation of the sagittal plexus showing its asymmetrical character and its conversion into the superior sagittal sinus. Draining into it from below is the drainage-channel from the chorioidal bodies that is later known as the straight sinus. The channels marked x are interpreted as undergoing retrogression, being replaced by more caudal channels. Large dural channels do not persist in the areas covering the cerebral hemispheres; they are found only in the loose embryonic tissue filling the spaces and fissures that lie between the different subdivsions of the brain.

  • Figure 7 is a vertex view of a human embryo 13.8 mm long (Carnegie Collection. No. 940).
  • Figure 8 is a vertex view of an embryo 20 mm long (Carnegie Collection, No. 349).
  • Figure 9 is a drawing of an injected and cleared specimen 54 mm long (Carnegie Collection, No. 458) reversed.


Serial No. Size (mm) Grade Fixative Embedding Medium Plane Thinness (µm) Stain Year Notes
940 E, 14.0 Ch, 28x23x21 Good Formol C Trans. 40 H.&E, or. G. 1914 Carnegie stage 17 Advanced
349 E, 24 Good Zenker C Cor. 250 Unstained 1905 Carnegie stage 21 Double vascular injection


1921 Human Brain Vascular: Fig 1 | Fig 2 | Fig 3 | Fig 4 | Fig 5 | Fig 6 | Fig 7-9 | Fig 10 | Fig 11 | Fig 12 |Fig 13 | Fig 14 | Fig 15 | Fig 16 | Fig 17 | Fig 18 | Fig 19 | Fig 20 | Fig 21 | Fig 22 | Fig 23 | Fig 24 | Fig 25 | Fig 26 | Fig 27 | Plate 1 - embryos 4 mm to birth | Plate 2 - embryo 4 mm | Plate 3 - embryo 11.5 mm | Plate 4 - embryo 21 mm | Plate 5 - embryo 43 mm | Carnegie No.24 | George Streeter


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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)

Reference

Streeter GL. The developmental alterations in the vascular system of the brain of the human embryo. (1921) Contrib. Embryol., Carnegie Inst. Wash. 8:7-38.


Cite this page: Hill, M.A. (2024, February 24) Embryology Streeter1921 fig07-09.jpg. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/File:Streeter1921_fig07-09.jpg

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