Canine tongue

Extends from oral cavity into oropharynx.  Muscular organ.  Covered with stratified squamous epithelium (heavier keratinized). 

Covered with papillae types: 1. Filiform – soft protective.  Fungiform, foliate and vallate give taste in tongue. 

Tip of tongue is apex and most caudal is called root that attaches to hyoid apparatus.

Palatoglossal folds = side of tongue and join palate at top = entry into oropharynx. 

Frenulum – attaches at midline to floor of mouth (rostral end of base of tongue).  Either side of frenulum is sublingual caruncles – forming opening to some salivary ducts. 

Extrinsic muscles = 1. Geniohyoideus – from mandible (incisive area) and runs to hyoid apparatus to draw tongue rostrally.
2. Genioglossus – arises at incisive area of mandible and fans into tongue body.  Pulls apex of tongue caudally, draws body rostrally and dorsum of tongue ventrally.
3. Hyoglossus – arises from basihyoid bone and runs into tongue (lateral genioglossus).  Draws tongue caudally.
4. Styloglossus – arises at stylohyoid and runs lateral to hyoglossus and draws tongue caudally and dorsally (base of tongue).
5. Mylohyoideus – transverse sling that runs from side to side of mandible.  Supports extrinsic muscles of tongue. 

Development = from 4 swellings on floor of pharynx. 

Lateral swellings – body and apex, 1st and 2nd arches.  Gives general sensation by CN5 and taste sensation by cranial nerve 7.
Proximal swelling – root of tongue sensation via CN9 and CN10.

Median swelling – tongue innervated by CN12 and all motor function through this nerve. 

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About Annettevet

I'm a Norwegian practicing as a veterinarian in Durham, England. I`ve recently qualified as a veterinarian at Glasgow University. This is a blog about my experiences as a vet student and now as a veterinarian. “The greatness of a nation and its moral progress can be judged by the way its animals are treated”
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One Response to Canine tongue

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