Development of the endocrine system alpha cells. The insulin concentration within the fetal pancreas is 3.6 pmol/g at seven to ten weeks, which rises to 30 pmol/g at 16–25 weeks of gestation. Near term, the insulin concentration increases to 93 pmol/g. The endocrine cells have dispersed throughout the body within 10 weeks. At 31 weeks of development, the islets of Langerhans have differentiated. While the fetal pancreas has functional beta cells by 14 to 24 weeks of gestation, the amount of insulin that is released into the bloodstream is relatively low. In a study of pregnant women carrying fetuses in the mid-gestation and near term
Ryan Langerhans In 2002, Langerhans was promoted to the Double-A Greenville Braves of the Southern League. He batted .251 with 23 doubles, 2 triples, 9 home runs, and 62 RBIs in 109 games. Langerhans was called up to the Atlanta Braves from the Double-A Greenville Braves in April, 2002. He appeared in one game that season where he had one at-bat against the Houston Astros where he did not record a hit. He was sent back down to the minors to start the 2003 season where he batted a combined .261 with 33 doubles, 4 triples, 10 home runs, and 49 RBIs