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44 Cards in this Set
- Front
- Back
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lips muscle layers
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1. mucosa- moist lining layer made up of epithilial surface overlaying connective tissue layer known as lamina propria
2. muscle, tendon salivary glands with ducts opening through oral mucosa 3. skin |
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orbicularis oris
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encircles opening of oral cavity within lip and acts to close lips
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caninus
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snarling in the dog
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levator nasolabialis
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lifts nose and upper lip
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levator labii superioris
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lifts upper lip
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depressor labii superioris
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not in cat, dog
depresses lower lip |
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lip muscles innervated by
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cranial nerve VII (facial nerve)
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cheeks
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form walls of oral cavity caudal to lips
together with lips form vestibule layers as for lips |
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buccinator muscle
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function to return blood from vestibule to oral cavity proper
extend from upper jaw to mandible |
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palate
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roof of oral cavity, separates oral cavity from nasal cavity
compromised of hard and soft palates |
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hard palate
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bone covered by thick mucosa which from ridges (ruga)- guide food backwards
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soft palate
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muscosal layers separated by salivary glands and 3 paired muscles which shorten, tense and raise the palate
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root of tongue is attached to
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hyoid appratus (fine bony structure suspended from skull)
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body of tongue is attached to
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mandible (rostral to root)
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apex of tongue is
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free end, rostral to body, can move around
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frenulum
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connects tongue to floor of oral cavity
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intrinsic tongue mousles
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longitutidal, transverse, verticule bundles
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extrinsic tongue muscles
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various muscles which originate on the hyoid apparatus or mandible, insert in the tongue and act to elevate, protrude, or retract the tongue
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filiform papilla
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most abundent
protection points directed caudally |
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conical papilla
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enlarged filiform papilla, roughness of cats tongue
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fungiform papilla
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carry taste buds
evenly dispursed |
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vallate papilla
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carry taste buds
4-6 present larger fungiform |
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foliate papilla
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carry taste buds
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taste buds
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clusters or specialised cells embedded in epithelium covering papilla
base cells in contact with fibers of nerves that convey sense of taste to brain |
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nerve fibres that convey sense of taste to brain
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cranial nerve VII (facial)
IX (glossopharyngeal) |
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motor innervation
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all intrinsic and extrinsic muscles innervated by cranial nerve XII (hypoglossal)
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Sensory innervation
rostral 2/3 |
cranial nerve V (trigeminal)
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sensory innervation
caudal 1/3 |
cranial nerve IX ( gloosopharyngeal)
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taste
rostral 2/3 |
cranial nerve VII (facial)
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taste
caudal 1/3 |
cranial nerve IX (glossopharyngeal)
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jaw closing muscles are innervated by
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mandibular branch of trigeminal nerve (cranial nerve V)
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Temporalis muscles
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origion on extensive area of lateral surface of cranium and insertion on coronoid process of mandible
contraction pulls mandible upward large in carnivores, relatively small in herbivores |
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masseter muscle insertion and origion
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origion- maxillary region of skull and zygomatic arch
insertion- wide area of caudal mandible |
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masseter muscle actions
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raise mandible (close jaws)
move lower jaw laterally when contracted on one side- greater sideways movement in herbivores protrude lower jaw |
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pteygoid muscles insertion and origion
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medial to mandible
origion- pterygopalatine region of skull insertion- medial face of mandible |
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digastricus muscle innervation
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both by mandibular branch of trigeminal nerve and facial (cranial nerve VII)
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digastricus origion and insertion
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origion- occipital bone of skull, caudal to tempormandibular join
insertion- on mandible |
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digastricus action
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open jaw
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