Nephrons (definitive urine-forming units) begin to form from the metanephric blastema, increasing in number to approximately 1 million per kidney at birth (presumed complete).
Duration: 32 weeks
Moore KL, Persaud TVN. 1998. The Developing Human: Clinically Oriented Embryology. 6th ed. Philadelphia: WB Saunders Co.
Circular muscle is present in esophagus.
Mitsui T, Sugiyama N, Maeda S, Tohyama C, Arita J. 2006. Perinatal exposure to 2,3,7,8-tetrachlorodibenzo-p-dioxin suppresses contextual fear conditioning-accompanied activation of cyclic AMP response element-binding protein in the hippocampal CA1 region of male rats. Neurosci Lett 398(3):206-210.
Parenchymal and bile duct cells show immunostaining for human growth hormone receptors.
Simard M, Manthos H, Giaid A, Lefebvre Y, Goodyer CG. 1996 Aug. Ontogeny of growth hormone receptors in human tissues: an immunohistochemical study. J Clin Endocrinol Metab 81(8):3097-102.
Kidney tissues show positive immunostaining for human growth hormone receptors.
Duration: 1 week
Simard M, Manthos H, Giaid A, Lefebvre Y, Goodyer CG. 1996 Aug. Ontogeny of growth hormone receptors in human tissues: an immunohistochemical study. J Clin Endocrinol Metab 81(8):3097-102.
Smooth muscle layers of the intestinal wall show immunostaining for human growth hormone receptors.
Duration: 1 week
Simard M, Manthos H, Giaid A, Lefebvre Y, Goodyer CG. 1996 Aug. Ontogeny of growth hormone receptors in human tissues: an immunohistochemical study. J Clin Endocrinol Metab 81(8):3097-102.