L18 Digestive system II

L18 Digestive system II - Digestive system II MUSCULAR...

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Digestive system II
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MUSCULAR TONGUE – tetrapods – very important for moving and swallowing food Derived from several areas of floor of pharynx Often rough e.g. cats Often used in food gathering – frogs, salamanders, lizards, ant-eaters http:// www.youtube.com/watch?v =C9cITqEbT7o
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Tongue also site of tastebuds Snakes – detects olfactory cues Speech!
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Development of the digestive system
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coelom dorsal mesogastrium ventral mesogastrium endodermal lining After folding -
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vitelline duct to yolk sac allantois foregut midgut hindgut
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Foregut Pharynx Lungs Esophagus Stomach Duodenum Biliary apparatus
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Gall bladder is a branch of the hepatic diverticulum. Pancreas arises from 2 buds a dorsal and a ventral. The ventral swings round to fuse with the dorsal
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Midgut Small intestines Caecum Appendix Ascending colon 2/3 Transverse colon
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midgut
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Hindgut 1/3 Transverse colon Descending colon Sigmoid colon Rectum Top of anal canal
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allantois anal pit Separate the hindgut into 2 parts
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Structure of the digestive system
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This note was uploaded on 08/28/2011 for the course ZOO 3713c taught by Professor Staff during the Spring '08 term at University of Florida.

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L18 Digestive system II - Digestive system II MUSCULAR...

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