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Plate II

(FIGS. 8-11).

Fig. 8. Section 177, X 25. Outline of section to show size of the sinus formed by union of umbilical veins; V, Umbilical venous sinus (from union of the umbilical veins); All, Allantois, shown in two places, the lower is before division, the upper is terminus of long branch; Ch, Chorion; Vi, Chorionic villus, showing syncytial bud; U, Umbilical artery, shown in two places below, before union to form umbilical arterial sinus, and above, tip of sinus and large branches.

Fig. 9. Section 188, X 25. Outline of section to show size of sinus formed from union of umbilical arteries. U, Umbilical arterial sinus; All, The terminus of the short branch of the allantois; Ca, Capillaries and small branches of sinus in chorion; Ch, Chorionic Membrane; Vi, Chorionic villus, showing capillary entering.

Fig. 10. X 525. Capillaries from chorion, showing apparent formation of blood corpuscles from endothelium of capillaries.

Fig. 11. Reconstruction of coelom, showing relation to somites; Arabic numbers on side represent the numbers of sections; Roman numerals in center represent the paired somites; P.C., Pericardial coelom; Pl, Pleural coelom; Coe, Peritoneal coelom; E.C., External Communication of the coelom: Pr, Pronephros; Ht, Projection of the heart in the pericardial cavity; X. Outer limit of body wall; Mes, Paraxial mesoblat; Br.M., Bridge of mesodermal -tisue extending across the mesodermal slit; Pr.S., Primitive streak.

Online Editor - embryo corresponds to Carnegie stage 10 in Week 4.

Historic Papers: 1910 | 1917 | 1926 | 1939 | 1943 | 1957 | 1985

Week:	1	2	3	4	5	6	7	8
Carnegie stage:	1 2 3 4	5 6	7 8 9	10 11 12 13	14 15	16 17	18 19	20 21 22 23

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