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11 Cards in this Set
- Front
- Back
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Sulcus Terminalis
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-divides tongue into anterior 2/3 and posterior 1/3
-circumvallate papillae restricted to this area |
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Filiform Papillae
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-most numerous, smallest papillae
-on entire anterior dorsal surface of tongue -conical, stratified squamous -no taste buds -mechanical function |
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Fungiform Papillae
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-mushroom shaped
-entire dorsal surface of tongue -more at tip -taste buds in epithelium, dorsal aspect of papillae |
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Circumvallate Papillae
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-large, dome-shaped
-only anterior to sulcus terminales -each papilla: moat-like space with stratified squamous epithelium -lateral surface epithelium has taste buds -Von Ebner's glands: ducts of lingual salivary glands- deposit serous secretion into moat for cleaning - |
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Alimetary Canal Layers
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-Mucosa
-Submucosa -Muscularis -Serosa (adventitia) |
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3 layers of Mucosa
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-epithelium
-lamina propria -muscularis mucosae |
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Mucosa- epithelium
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1. Facilitates passages of bolus
2. Provides selectively permeable barrier between body/external en 3. absorbs digestion produces- transports to vascular sys |
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Mucosa- Lamina Propria
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-loose connective tissue
-fenestrated capillaries for absorption -contains glands -contains immune sys components -absorption in small/large intestine -many lymph capillaries- receive lipids and proteins |
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Mucosa- Muscularis Mucosae
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-boundary between mucosa and submucosa
-deepest portion of mucosa -two layers: inner circular and outer longitudinal (can produce mucosa movement independent of entire gut wall) |
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Submucosa
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-dense irregular connective tissue
-larger blood vessels- send branches to mucosa, muscularis externa, and serosa -lympathics -esophagus and initial part of duodenum have submucosal glands -nerve plexuses = submucosal plexus (Meissner's); innervate smooth muscle |
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Muscularis Externa
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-aka Muscularis
-two cocentric thick layers of smooth muscle -inner layer = circular layer- tight spiral -outer loose spiral = longitudinal layer -Myenteric plexus (Auerbach's)- part of enteric division of ANS; postganglionic parasympathetic neurons |
