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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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