Aural Surgery Flashcards
know anatomy of the ear
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What is a part of the ear that is impt with vestibular dz?
Promontory in the cochlear (round) window
What forms the shape of the pinnae? What is it comprised of?
Auricular cartilage; numerous holes which are transversed by the branches of the caudal auricular artery
What canal(s) makes a 70 degree angle
Vertical and horizontal canals
What is in the middle ear?
Tympanic membrane, tympanic cavity, tympanic bulla, auditory vesicles, & auditory tube
What two nerves course the inner ear?
Facial and vagus nerve
What are in the inner ear?
Cochlea, vesticuble (saccule), and semi-circular canals functioned for balance and hearing
Pars tensa
semi-transparent + glistening
Pars flaccida
opaque, pinkish to white color with superficial vessels; dorsal portion of the tympanic membrane
Signalment of otitis patients-
most common in middle aged dogs, kittens and young adults but more common in dogs
Where are the auditory ossicles?
Transverse middle ear
What is the preferred technique for severe otitis externa?
TECA-BO
What sx if best for palliative in some cases of ear canal dz?
LECR/VECR
What is the def. tx for otitis or ear canal neoplasia?
TECA-BO
What is the def. sx tx for inflamm. polyps in cats??
VBO/Traction-Avulsion
How is the anatomy of the feline ear different?
Nasopharyngeal polyps are between the septum bullae and the promontory and so we need to break down that cartilage septum
What do we do for cats that have chronic polyps in their ear?
Ventral bulla osteotomy
End stage ear disease involves mineralization and/or ____ ____
canal stenosis
What is the preferred modality for evaluating chronic otitis externa?
CT
Is vertical ear canal resection indicated for tx of chronic otitis externa?
no
What are some complications of TECA-BO?
Infection, hearing loss, sympath. n injury, inner ear trauma, chronic fistulas
Ear canal neoplasia is usually which type?
Carcinoma (Ceruminous gland or SCC)
Which nerve should you be aware of during aural surgery as it exits caudal to the tympanic bulla and runs ventral to the horizontal ear canal?
Facial nerve
What vessels are ventral to the tympanic bulla that you should be aware of during aural surgery?
External carotid a and maxillary v
What vessels are cranial to the tympanic bulla that you should be aware of during aural surgery?
retroarticular vein - can cause major hemorrhage
What are the surgical options for ear disease?
- lateral ear canal resection (LECR)
- vertical ear canal resection (VECR)
- total ear canal ablation and lateral bulla osteotomy (TECA-BO)
T/F: A lateral ear canal resection is appropriate for most cases of otitis externa.
F
What are the indications for performing a vertical ear canal resection?
- remove tumors
- traumatic ear injuries
- drain horizontal canal
What is the preferred surgical technique for severe otitis externa?
TECA-BO
What nerve should you make sure to avoid when performing a ventral bulla osteotomy? VBO
hypoglossal n
Where do feline inflammatory polyps originate from?
Middle ear
What type of neoplasia occurs in the ear canal most commonly?
SCC or the ceruminous gland usually
Inner ear components (3)
- cochlea
- vestibule
- semicircular canal
Is the ear mite burrowing or not?
Not
