KINESIOL 1Y03 Lecture Notes - Lecture 6: Urethra, Mesonephric Duct, Bronchus
20 Apr 2016
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Endothelial cells from one blood island will connect to another to form tubes > extensive network: circulatory system! Signal from endoderm layer > mesoderm > take some of the tubes ur making and fuse them. ~22 days> primitive heart tube will mature: confined within space of pericardial cavity so as the heart tries to expand the limit of the cavity makes it start to bend. Incomplete fusion of walls between atria > 2 separate septums like holes > interatrial septum. Lots of pressure in right side of heart > pushes blood thru foramen ovale to the left side, bypassing the lungs bc still no proper lungs in fetus. Derived from the duct tube from online lecture. Evagination of future trachea >> more budding off evagination > lung buds! Separation between gut tube and trachea at 35 days. Day 50: more mature divisions> 3 lobes at right side of lungs.
