. A laboratory manual and text-book of embryology. Embryology. ioS THE STUDY OF SIX AND TEN MILLIMETER PIG EMBRYOS sinusoids. Their proximal vitelline trunks drain the blood from the liver and open into the sinus vcnosus of the heart. The right vitelline trunk is much the larger and persists as the proximal portion of the inferior vena cava (for the de- velopment of the portal vein see Chapter IX). The umbilical veins, taking their origin in the walls of the chorion and allan- toic vesicle, he caudal and lateral to the allantoic stalk and anastomose (Figs. 97 and 99). Before the allantoic stal
. A laboratory manual and text-book of embryology. Embryology. ioS THE STUDY OF SIX AND TEN MILLIMETER PIG EMBRYOS sinusoids. Their proximal vitelline trunks drain the blood from the liver and open into the sinus vcnosus of the heart. The right vitelline trunk is much the larger and persists as the proximal portion of the inferior vena cava (for the de- velopment of the portal vein see Chapter IX). The umbilical veins, taking their origin in the walls of the chorion and allan- toic vesicle, he caudal and lateral to the allantoic stalk and anastomose (Figs. 97 and 99). Before the allantoic stalk enters the body, the umbilical veins sepa- Spina! cord Ant. cardinal vein Cervical sinus Pericardia! cavity Atrial junction sinus- venosus Sinus venosns Right vitelline vein Liver Large venous sinusoid of Liver Hepatic diverticulum {cut) Yolk-stalk Portal vein Cephalic limb intestinal loop Right umbilical vein Vitelline artery Caudal limb intestinal loop / Right umbilical artery Dorsal aorta. Kolochord Ant. cardinal vein Pharynx Pericardial cavity Left common cardinal vein -Left horn of sinus veuosus Left vitelline vein Ductus veuosus Ant. limb bud Inf. vena cava Dorsal pancreas Left vitelline vein Common vitelline vein Left umbilical vein Sup. mesenteric vein Left umbilical artery Post, limb bud Spinal cord Fig. 97.—Reconstruction in ventral view of a 6 mm. pig embryo to show the vitelline and umbilical veins, the latter opened (original drawing by Mr. K. L. Vche). rate and run lateral to the umbilical arteries. The left vein is much the larger. Both, after receiving branches from the posterior limb buds and from the body wall, pass cephalad in the somatopleure at each side. Their course is hrst cephalad, then dorsad, until they enter the liver. The left vein enters a wide channel, the ductus venosus, which carries its blood through the liver, thence to the heart by way of the right vitelline trunk. The right vein joins a large sinu- soidal continuation of the portal vein
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectembryology, bookyear1
