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Food Prehension and mastication (Muscles of the tongue - GLOSSALS (Muscles…
Food Prehension and mastication
PREHENSION
Seizing and conveying of food
Primary prehensio organs include
Lips
Cheeks
Teeth
Tongue
Horses
Sensitive and mobile lips - When grazing draw back and sever grass (short)
Use vibrassae (Whiskers) to seek out food etc
Sheep
Cleft upper lip
Draw teeth closer to grass
Pigs
Root around using snout
Have round disk at end of nose
Cattle
Limited lip movement
Less sensitive
Pull grass out from roots
Sideways pull of head to enable more force
Dogs and cats
Lap fluids up using tongue in curling method
Muscles of prehension
Orbicularis Oris
FACIAL NERVE
CLOSES mouth
Sucking and drinking
Donut around the mouth
Levator Labii Superioris
FACIAL NERVE
Lifts upper lip
Levator nasolabialis
FACIAL NERVE
Lifts upper lip and nostril
Caninus
Upper lip
Nostril
Retractor
Zygomaticus
FACIAL NERVE
Retractor of caudal comissure of lip
Depressor labii inferioris
Depresses lower lip
FACIAL NERVE
ONLY HERBIVORES HAVE THIS.
ALL INNERVATED BY FACIAL NERVE, RECEIVE SENSORY INPUT FROM TRIGEMINAL NERVE - maxillary and mandibular branches
BUCCINATOR
Forms Diaphragm of muscles over the cheek wall
Facial nerve
TONGUE - Labium
Species variation of...
Texture
Rough - CAT for grooming due to papillae & Ruminant
Soft - Dog, horse, pig
Shape
Horse 0 Free
Dog - Free with median sulcus
Ox - Pointed
Muscles of the tongue - GLOSSALS
Tearing, chewing of food
Muscles of mastication?
Originate from the mesoderm of pharyngeal arch 1 X3
Masseter - Round shape I
Temporalis
Pterygoid
ALL innervated by mandibular trigeminal
Digastricus
Geniglossus - Tongue out
Styloglossus - Retracts tongue
Hyoglossus - Depresses and retracts tongue
Innervated by the Hypoglossal nerve (SE)
Extrinsics:
Other Muscles
Geniohyoids - BELOW TONGUE
Sternohyoids - Pulls hyoid caudally
Intrinsic muscle: Propria Linguae