File:Streeter-plate04.jpg

Plate 4. Left lateral view of a wax-plate reconstruction of the larger blood-vessels of the brain in a human embryo 21 mm long

Carnegie Collection Embryo No. 460

Enlarged 16.4 diameters.

• Instead of the head being drained by the primary head-vein, this is now accomplished by a more dorsally situated channel that has formed through the meshes of the middle and posterior dural plexuses to become the transverse sinus.
  • Compare with text-figure 3. which shows a left profile of the same specimen.
• All that is left of the primary head-vein is that portion which is to become the cavernous sinus.
• In this model the right cerebral hemisphere has been dissected so as to expose the chorioidal body with its arterial feeder anil the straight sinus draining it.
• The plexiform character of the superior sagittal sinus and of the caudal end of the straight sinus is indicative of their transitory condition.

--Mark Hill 09:37, 17 February 2011 (EST) Estimated as Carnegie Stage 20 Week 8 on basis of CRL. Unknown Shrinkage.

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, April 16) Embryology Streeter-plate04.jpg. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/File:Streeter-plate04.jpg

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