File:Streeter1921 fig27.jpg

Figure 27. Left profile view of a wax-plate reconstruction of the blood-vessels of the brain in a human embryo 43 mm long

Carnegie Collection Embryo No. 886

Enlarged 8 diameters. (original print version)

• The vascular architecture is at this stage beginning to approximate the adult condition, although the whole tentorial region retains its embryonic character, due to which the marked subsequent migration of the transverse sinus is possible.
• It will be noted that the sigmoid portion of the sinus is fairly well established.

--Mark Hill 09:39, 17 February 2011 (EST) Post-Embryonic based upon CRL. Figure same as cropped Plate 5.

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 Textbook" and "Historic Embryology" appear on this site, 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 interpretation of developmental mechanisms reflect the understanding at the time of original publication and those of the preceding periods, these interpretations may not reflect our current scientific understanding. (More? Embryology History)

Reference

The Developmental Alterations in the Vascular System of the Brain of the Human Embryo Contributions to Embryology Carnegie Institution No.24 by George L. Streeter, with five plates and twelve text-figures (1921).