. On the theory and practice of midwifery . Diagram of the foetus and membranes about the fourth week. a. Vesicula umbilicalis, already passing into the ventricularand rectum intestine at g. b. Vena and arteria omphalo-mese-raica. c. Allantois springing from the pelvis with the umbilicalarteries, d. Embryo, e. Amnion. /. Chorion. From Carus. two umbilical arteries and the umbilical vein, the urachus, the vasa om-phalo-meseraica, or vein and artery of the vesicula umbilicalis, and per-haps, even at this period, the duct of communication between the intestinalcanal and vesicula umbilicalis, the
. On the theory and practice of midwifery . Diagram of the foetus and membranes about the fourth week. a. Vesicula umbilicalis, already passing into the ventricularand rectum intestine at g. b. Vena and arteria omphalo-mese-raica. c. Allantois springing from the pelvis with the umbilicalarteries, d. Embryo, e. Amnion. /. Chorion. From Carus. two umbilical arteries and the umbilical vein, the urachus, the vasa om-phalo-meseraica, or vein and artery of the vesicula umbilicalis, and per-haps, even at this period, the duct of communication between the intestinalcanal and vesicula umbilicalis, the foetal extremity of which, according toProfessor Okens views, forms the processus vermiformis. The hands seem to be fixed to the shoulders without arms, and the Fig. Diagram of the fcetus and membranes about the sixth week. a. Chorion, b. The larger absorbent extremities, the site of the Allantois. d. Amnion, e. Urachus. e. Bladder. /. Vesicula umbili-calis. g. Communicating canal between the vesicula umbilicalis and intestine. h. Vena umbilicalis. i, i. Arteriae umbilicales. I. Vena omphalo-meseraica. Ar. Arteria omphalo-meseraica. n. Heart, o. Rudiment ofsuperior extremity, p. Rudiment of lower extremity. From Carus. 136 TJTERO-GESTATION. feet to adhere to the ossa ilii; the liver seems to fill the whole abdomen;the ossa innominata, the ribs, and scapulae, are cartilaginous. In a short time the little stump-like prominences of the extremitiesbecome longer, and are now divided into two parts, the superior into thehand and the fore-arm, the inferior into the foot and leg; in one or twoweeks later, the arms and thighs are visible. These parts of the extremi-ties which are formed later than the others, are at first smaller, but as theyar
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