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Plate I

(Figs. 1—7).

Fig. 1. Section 22, X 50. B1, First primary brain vesicle; Oo, Aorta; A1, Complete View of longitudinal section of tirst aortic arch; A2, Cross section of stub of second aortic arch; En, Endothelial heart; Ht, Mesodermal wall of heart; P.C., Pericardial cavity; Fg, foregut; Am, Amnion; Mes, Mesoderm; Ent, Entoderm.

Fig. 2. Section 53, X 50. Ch, Chorda; Ao, Dorsal aorta; V, Umbilical vein; Fg, Foregut; P.C., Pericardial cavity; B2, Second primary vesicle of the brain.

Fig. 3. Section 76, X 50. Pr, Pronephros; Coe, Coelom; Pl, Pleural Cuelom; V, Umbilical vein; Br V, Branch of umbilical vein, only suggestion of a vitelline vein, it unites with umbilical vein two sections below; Ch, Chorda; M1, First Somite in each side.

Fig. 4. Section 93, X 50. Br, Cross section of lateral branch of dorsal aorta; V, Umbilical vein; M4, Somite IV, with cavity (anterior tip of somite IV on opposite side) ; Coe, Coelom; E.C., Communication of coelom with exterior; Ch, Chorda.

Fig. 5. Section 101, X 50. Br. Lateral branch of Aorta; Ao, Aorta; V, Umbilical vein; M4, Somite IV with cavity; M5, Tip of Somite V; Coe, Coelom.

Fig. 6. Section 137, X 50. A0, Dorsal aorta; Br, Lateral branch of aorta (branch on left side terminates in a mass of mesodermal cells which may be a small blood island); Ch, Chorda at point of greatest development; Coe, Coelom; S.M, Slit in mesoderm. (See also Fig. 11.) Pr. S, Beginning of primitive streak. U. V, Umbilical vesicle.

Fig. 7. Section 152, X 50. Shows primitive streak region (Pr. S.) from fusion of ectoderm, mesoderm and entfoderm. Hg, Hindgut; A11, Allantois, near point of origin from hindgut; U, Umbilical artery; V, Umbilical vein; S. M, Slit in mesoderm. Ect, Ectoderm; Ent, Entoderm; Mes, Meoderm.

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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