A system of midwifery . nd month a Vesicula umbilicalis already passing into the ventricular andrectum intestine at g. b Vena and arteria Allantois springing from the pelvis with the umbilical arteries,rf Embryo, e Amnion. /Chorion. From Cams. Diagram ofthefatusand membranes aboutthe fourth week. as a small vesicle, not larger than a pea, near the insertion of the cord atthe navel, and external to the amnion. From the trunk, which is almostentirely occupied by the abdominal cavity, arises a short thick umbilicalcord, in which some of the convolutions of the intestines may s
A system of midwifery . nd month a Vesicula umbilicalis already passing into the ventricular andrectum intestine at g. b Vena and arteria Allantois springing from the pelvis with the umbilical arteries,rf Embryo, e Amnion. /Chorion. From Cams. Diagram ofthefatusand membranes aboutthe fourth week. as a small vesicle, not larger than a pea, near the insertion of the cord atthe navel, and external to the amnion. From the trunk, which is almostentirely occupied by the abdominal cavity, arises a short thick umbilicalcord, in which some of the convolutions of the intestines may still betraced. Besides these it usually contains, as already observed, the twoumbilical arteries and the umbilical vein, the urachus, the vasa omphalo-meseraica, or vein and artery of the vesicula umbilicalis, and perhaps,even at this period, the duct of communication between the intestinal canaland vesicula umbilicalis, the foetal extremity of which, according to Pro-fessor Okens views, forms the processus Diagramof the fostus and membranes about the sixth week. a Chorion, b The larger absorbent extremities, the site of theplacenta, c Allantois. d Amnion, e Urachus. i Bladder. /Vesi-cula umbilicalis. ^Communicating canalbevireen the vesicula um-bilicalis and intestine. A Vena umbilicalis. it Arteriae Vena omphalo-meseraica. h Arteria omphalo-meseraica. n Rudiment of superior extremity, ?p Rudiment of lower Carus. The hands seem to be fixed to the shoulders without arms, and the feetto adhere to the ossa illi; the liver seems to fill the whole abdomen ; theossa innominata, the ribs, and scapulae are cartilaginous. 68 DEVELOPMENT OF THE OVUM. 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 arras and thighs are visible. These parts of the extre-mities
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Keywords: ., bookcentury1800, booksubjectmidwifery, booksubjectpregnancycompl
