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38 Cards in this Set
- Front
- Back
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Which two layers does the oral cavity lack that the rest of the digestive tract contains?
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Muscularis mucosa and serosa layer
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When is the oral epithelium more keratinised?
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At areas of high wear (abrasion and dessication)
In animals with coarse diet i.e. ruminants |
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What type of epithelium is oral epithelium?
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Stratified squamous epithelium (sometimes keratinised)
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What connects the epithelium and submucosa?
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Lamina propria
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Which layer is lacking in the mucosa of the oral cavity?
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Muscularis mucosa
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What are the 4 layers of the GI tract (not oral cavity)?
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Mucosa, submucosa, muscularis, serosa
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What 3 layers make up the mucosa of the GI tract and oral cavity?
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GI tract - epithelium, lamina propria, muscularis mucosa
Oral cavity - epithelium, lamina propria |
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What is the purpose of the lamina propria?
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It is highly vascularised and provides nourishment to the overlying epithelium (blood vessels do not cross basement membrane to epithelium)
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What does the submucosa contain?
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Loose collagenous tissue, blood vessels, lymphatics, nerves, small accessory salivary glands
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What is the function of the submucosa?
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Supports the mucosa and anchors it to musculature or bone
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What colour do the different types of gland stain?
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Serous - dark (pink)
Mucous - pale (purple) |
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How does the arrangement of skeletal muscle fibres allow for a great range of movement in the tongue?
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The muscle fibres are arranged in 3 planes at right angles to each other
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What is the epithelium like on the dorsal and ventral aspects of the tongue?
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Dorsal - keratinised stratified squamous epithelium
Ventral - stratified squamous epithelium |
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What are the 2 types of papillae found on the tongue?
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Mechanical or sensory/gustatory
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What is the function of mechanical papillae?
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Helps to facilitate the movement of digesta within the oral cavity
Provides some protection |
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What is the function of sensory/gustatory papillae?
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Contain taste buds which allow for the mediation of taste
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What are the 3 types of mechanical papillae?
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Filiform papillae
Conical papillae Lenticular papillae (in ruminants) |
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What are the 4 types of sensory/gustatory papillae?
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Fungiform papillae
Circumvallate papillae Foliate papillae Lenticular papillae (in cattle) |
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Name the type of papilla and its function
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CIrcumvallate
Gustatory |
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Name the type of papilla and its function
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Fungiform
Gustatory |
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Name the type of papilla and its function
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Foliate
Gustatory |
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Name the type of papilla and its function
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Mechanical in ruminants
Gustatory in cattle |
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Name the type of papilla and its function
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Filiform
Mechanical |
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Name the type of papilla and its function
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Conical
Mechanical |
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What is the difference in appearance between conical and filiform papillae?
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Conical papillae have a CT core
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Where are fungiform papillae found?
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Body and apex of tongue
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Where are taste buds found on fungiform papillae?
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On the upper surface
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What type of epithelium is found on fungiform papillae?
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Non-keratinised stratified squamous epithelium
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Where are circumvallate papillae found?
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Just rostral to the root of the tongue
(used as landmark for edible part of bovine tongue) |
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Where are taste buds found on circumvallate papillae?
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On the lateral surfaces
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What is the function of the gustatory serous glands?
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They have ducts which secrete a watery fluid that dissolves food and washes the sensory hairs, allowing new tastes to be recognised
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Where are foliate papillae found?
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At the lateral borders of the tongue, near the palatoglossal arches
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In what species are foliate papillae found?
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Prominent in rabbits, absent in ruminants
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Where are taste buds found on foliate papillae?
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At the lateral borders
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What are the 5 basic senses of taste?
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Sweet, salty, savoury, bitter, sour, umami
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Which tastes suggest a high-energy food and which tastes suggest a spoiled food?
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High-energy - sweet or umami
Spoiled - bitter or sour |
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What cells are taste buds made up of?
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Gustatory cells
Sustentacular cells Basal cells |
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Which cells of the taste bud stain darkly and lightly?
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Dark-stained - sustentacular
Light-stained - gustatory |
