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44 Cards in this Set

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lips muscle layers
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
orbicularis oris
encircles opening of oral cavity within lip and acts to close lips
caninus
snarling in the dog
levator nasolabialis
lifts nose and upper lip
levator labii superioris
lifts upper lip
depressor labii superioris
not in cat, dog
depresses lower lip
lip muscles innervated by
cranial nerve VII (facial nerve)
cheeks
form walls of oral cavity caudal to lips

together with lips form vestibule

layers as for lips
buccinator muscle
function to return blood from vestibule to oral cavity proper

extend from upper jaw to mandible
palate
roof of oral cavity, separates oral cavity from nasal cavity

compromised of hard and soft palates
hard palate
bone covered by thick mucosa which from ridges (ruga)- guide food backwards
soft palate
muscosal layers separated by salivary glands and 3 paired muscles which shorten, tense and raise the palate
root of tongue is attached to
hyoid appratus (fine bony structure suspended from skull)
body of tongue is attached to
mandible (rostral to root)
apex of tongue is
free end, rostral to body, can move around
frenulum
connects tongue to floor of oral cavity
intrinsic tongue mousles
longitutidal, transverse, verticule bundles
extrinsic tongue muscles
various muscles which originate on the hyoid apparatus or mandible, insert in the tongue and act to elevate, protrude, or retract the tongue
filiform papilla
most abundent
protection
points directed caudally
conical papilla
enlarged filiform papilla, roughness of cats tongue
fungiform papilla
carry taste buds
evenly dispursed
vallate papilla
carry taste buds
4-6 present
larger fungiform
foliate papilla
carry taste buds
taste buds
clusters or specialised cells embedded in epithelium covering papilla

base cells in contact with fibers of nerves that convey sense of taste to brain
nerve fibres that convey sense of taste to brain
cranial nerve VII (facial)
IX (glossopharyngeal)
motor innervation
all intrinsic and extrinsic muscles innervated by cranial nerve XII (hypoglossal)
Sensory innervation
rostral 2/3
cranial nerve V (trigeminal)
sensory innervation
caudal 1/3
cranial nerve IX ( gloosopharyngeal)
taste
rostral 2/3
cranial nerve VII (facial)
taste
caudal 1/3
cranial nerve IX (glossopharyngeal)
jaw closing muscles are innervated by
mandibular branch of trigeminal nerve (cranial nerve V)
Temporalis muscles
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
masseter muscle insertion and origion
origion- maxillary region of skull and zygomatic arch

insertion- wide area of caudal mandible
masseter muscle actions
raise mandible (close jaws)
move lower jaw laterally when contracted on one side- greater sideways movement in herbivores
protrude lower jaw
pteygoid muscles insertion and origion
medial to mandible
origion- pterygopalatine region of skull
insertion- medial face of mandible
digastricus muscle innervation
both by mandibular branch of trigeminal nerve and facial (cranial nerve VII)
digastricus origion and insertion
origion- occipital bone of skull, caudal to tempormandibular join

insertion- on mandible
digastricus action
open jaw