File:Evans1909 fig15.jpg

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Fig. 15. Pig Embryo 8 mm

Fig. 15 a. Lateral view of upper portion of pig embryo 8 mm. long, showing location of mid dorsal non-vascular area, the extent of which has been purposely exaggerated laterally. It will be noted that the capillaries have fused dorsally over the mid brain and upper portion of the hind brain.

Fig. 15 b. Dorsal view of fore and mid brain region of the pig of 8 mm. shown in fig. 15 a, showing the limit of extension of the capillary plexus here. The mesh work which has grown dorsally from either side halts sharply in two parallel lines between which is the narrow non-vascular strip. Anteriorly is seen the earliest indication of the superior sagittal sinus, which is formed from either margin of the capillary mesh, and consequently at this stage paired.

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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)

Evans (1909) Figures: 1 Chick 17 somites | 2 Chick 20 somites | 3 Chick 23 somites | 6 Chick lateral 25 somites |


Evans HM. On the development of the aortae, cardinal and umbilical veins, and the other blood vessels of vertebrate embryos from capillaries. (1909) Anat. Rec. 3: 498-518.

Cite this page: Hill, M.A. (2024, June 13) Embryology Evans1909 fig15.jpg. Retrieved from

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