Derivative of the foregut

Derivative of the foregut - Derivative of the foregut .back...

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Derivative of the foregut «...back This note covers derivatives of the foregut. Introduction In the developing embryo the foregut gives rise to the all of the structures from the oesophagus to the duodenum. It also gives rise to the liver, gall bladder, and the respiratory tract. The lung buds The respiratory tract buds from the pharyngeal region of the forgut and develops into the trachea, bronchioles and lungs. As the bud elongates a grove called the laryngotraceal grove deepens. Abnormal connections across this grove occur in approximately 1:2500 births causing problems with food entering the respiratory tract. Canalisation of the Gut
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This process happens at week 6 in the developing embryo. Prior to week 6 the lumen of the GI tract is open. At week 6 the mucosal layer thickens and quickly occludes the lumen before reopening due to further growth of the muscular walls at week 8. If the lumen doesn’t reopen conditions such as pyloric stenosis occur causing the neonate to vomit due to food not being able to pass through the gut normally. Abnormalities of the Oesophagus
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This note was uploaded on 12/04/2011 for the course ANT ANT2000 taught by Professor Monicaoyola during the Fall '10 term at Broward College.

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Derivative of the foregut - Derivative of the foregut .back...

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