dig system - November 19, 2010 Organs of the Digestive...

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November 19, 2010 Organs of the Digestive system: Ch. 16 pg. 476-482; 495-503 Ch. 17 pg 518-553 Ch. 18 pg. 576-591; 594-602 Tackle structures found in the red boxes on this slide Digestive system is largely composed of the alimentary and GI tract. Essentially a big mucosal lined muscular tube. Closed off at either end by a skeletal muscle sphincter: mouth and the anus. 30ft long in cadaver but shorter in living individual because of tone in tube. Structures of alimentary canal: accessory glands Salivary glands Liver Pancreas Digestive processes: 6major activities 1. Digestion 2. Mechanical digestion 3. Propulsion 4. Chemical digestion 5. Absorption 6. Defecation Run into a shared structural canal which has 4 layers that are all within all parts of the tube but there are going to certain specializations in different areas of the tube which will optimize that part of the tube for its specific activity. (will be highlighting the different structural aspects of the tube and how they correlate to their actions) Color coded for where which action takes place in the GI tract Mucosa of oral cavity Food into oral cavity Consists of mouth and structures found w/in the mouth
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Figure of inside of mouth from book shown: not on slide Divided into 2 cavities Vestibule: area between lips and teeth/cheek and teeth Oral cavity proper: area behind the teeth bounded by hard/soft palate and end of oral cavity which is opening into pharynx Lined by mucosa (3 types) Masticatory mucosa: Line the hard and soft palate and the gums Different from other mucosas in that: It has a stratified squamous epithelium and an underlying lamina propia The part that lines the had/soft palate is keratinized stratified squamous epithelium ! And in some areas there is something called a parakeratinized epithelium Epithelium that has many of the histological features of keratinized stratified squamous epithelium BUT cells don’t lose their nuclei!!! (contain a lot of keratin but the cells remain with nuclei) Lining mucosa Line floor of oral cavity, inside of lips, and cheeks True nonkeratinized squamous epithelium and a lamina propia (loose areolar CT w/ salivary glands: intrinsic salivary glands AKA minor salivary glands-have ducts that open directly into the oral cavity) Specialized mucosa Specialized for gestation/taste Dorsal of the tongue ‘specialized’ relates to the fact that we have papillae on the dorsal of the tongue Peg like structures seen in lab Circumvallate: v-shaped portion in the back of the tongue Tongue and circumvallate papillae: Dorsal service of tongue is specialized mucosa Tip of some papillae we have a keratinized stratified squamous epithelium Have tastebuds: clusters of about 100 cells 3 cell types Supporting cells: (white) provide structural support
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Sensory receptor cells (neural epithelial cell-epithelial origin) Microvilli at apical tip (increase surface area) Receptor for the taste Basal cells: proliferate and replace neural epithelial tissue that have
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dig system - November 19, 2010 Organs of the Digestive...

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