No abstract available.
Cardiovascular System*

No abstract available.
Cardiovascular System*

No abstract available.
Chest Pain* ; Thorax*

No abstract available.
Urinary Incontinence*

No abstract available.
Humans ; Male* ; Osteoporosis*

No abstract available.
Humans ; Male*

The morphologic development of the liver in the embryonic period is described in serial sections of 18 human embryos representative of Horizons 12 to 23 . In the earliest specimen of horizon 12, the liver is seen as branching cord of endodermal cells originating from the hepatic diverticulum and invading into the loose stroma of septum transversum, transforming the surrounding stromal cells into primitive blood spaces and blood cells. Thereafter, the parenchymal cells rapidly proliferated so that the size of the organ was reaching a fifth of the CR length in horizon 23. The vascular system of the liver was in a symmetric configuration in horizon 12, which is composed of umbilical and vitelline veins and hepatocardiac channels on both sides. The evolution of the vascular system includes intergration of the vitelline veins into the portal vein, obliteration of the right umbilical vein and left hepatocardiac channel, and creation of the ductus venosus. The intrahepatic biliary tract is found to be formed by the "in situ transformation" mechanism, which involves transformation of the parenchymal cells, adjacent to the fibrous tissue surrounding the portal and umbilical veins, to networks of cuboidal epithelial cells lining the ductal lumen. These intrahepatic duct systems were found to communicate with the extrahepatic system at the porta hepatis.
Humans

No abstract available.
Sleep Disorders, Circadian Rhythm*

Laryngeal atresia is a very rare congenital anomaly requiring immediate tracheotomy. We present a case of laryngeal atresia with tracheoesophageal fistula who showed immediate respiratory difficulty after ligation of umbilical cord and died of aspiration pneumonia at 8 days of age. The atretic portion of larynx is composed of irregulary arranged cartilaginous tissue, bundles of intrinsic muscle and soft tissue without epithelium-lined lumen. The lungs show normal development and evidences of aspiration pneumonia.
Infant, Newborn ; Humans

The umbilical cord length may be a reliable indicator of fetal activity during gestation because it grows in response to tensile forces related to fetal movement. But there has been little attention to normal range of the umbilical cord length. We analyzed the umbilical cord length of 2342 cases de1ivered in Seoul National University Hospital to determine mean values according to the gestational age. The umbilical cord length increased linearly from 15.5cm of 13 week to 50.6 cm of 44 week. After 42 week, the growth was nearly stopped. There was no difference by fetal sex. The length of umbilical cord was variable even within same gestational age.