Exam 3: Paranasal Sinuses and Guttural Pouches Flashcards
Air-Filled, mucous membrane lined diverticula of nasal cavity
sinuses
Which bones of the skull contain sinuses?
nasal, frontal, maxillary
What are 4 functions of sinuses?
- thermal protection
- mechanical protection
- dec. wt. of skull
- resonance of voice
Clinical significance of sinuses?
- Trauma
- Association with dentition
- neoplasia
- infection
What are the 5 sinuses in animals?
- palatine
- sphenoid
3 frontal - maxillary
- lacrimal
Which sinus is absent in pigs and carnivors?
palatine
Which sinus is absent in dogs and small ruminants?
sphenoid
Which sinus is present in pigs and ruminants, and is an extension of the maxillary sinus
lacrimal
The paranasal sinus of the horse is made up of which 2 sinuses?
- frontal
2. maxillary
The frontal sinus plus the dorsal concha are together called:
conchofrontal sinus
The maxillary sinus invades which concha?
ventral
Maxillary sinus is divided into two parts:
- rostral
2. caudal
Surgical boundaries of eq. frontal sinus:
- Caudal: line through zygomatic process of frontal bone
- Rostral: Half way between orbit and infraorbital foramen
- median: 2cm from midline
- lateral: oblique line, from supraorbital foramen to rostral most portionof median limit
Surgical boundaries of eq. maxillary sinus:
- caudal: rostral portion of orbit
- infraorbital foramen
- Dorsal: line from infraorbital foramen to facial crest
- ventral: facial crest
T/F. frontal and dorsal conchal sinus communicate with eachother?
T
What are the frontal and dorsal conchal sinus referred to as?
conchofrontal sinus
Which sinus is found within the frontal and nasal bones?
conchofrontal sinus
Is the conchofrontal sinus superficial or deep to nasal cavities?
superficial
T/F. Conchofrontal sinus directly communicates with nasal cavity?
F. must pass through maxillary sinus first, then nasal cavity
Slit-like communication of maxillary sinus with nasal cavity.
Nasomaxillary opening
Where does the nasomaxillary opening open?
middle nasal meatus
How does the conchofrontal sinus communicate with the maxillary sinus?
frontomaxillary opening
The maxillary sinus contains the roots of which teeth?
PM4, M1-3
In bovine, the frontal sinus opens to the nasal passage via ______
ethmodial meatus
What are the 3 blind pouches of the bovine frontal sinus?
- postorbital diverticulum
- cornual diverticulum
- nuchal diverticulum
which blind pouch of the bovine frontal sinus is caudal and medial to the orbit?
postorbital diverticulum
Which blind pouch of the bovine frontal sinus occupies the base of the horn?
cornual diverticulum
Which blind pouch of the bovine frontal sinus is the most caudal end of the sinus?
nuchal diverticulum
Which blind ended pouch of the bovine frontal sinus is the largest?
postorbital diverticulum
Why must you dehorn cows at a young age?
to avoid damage to the cornual diverticulum
Surgical boundries of the frontal sinus in bovine:
- caudal: bse of skull
2. rostral: border of orbit
How does the bovine maxillary sinus communicate with the nasal cavity?
nasomaxillary opening
T/F the maxillary and frontal sinus communicate in the bovine
F
Surgical boundreis of maxillary sinus in cow:
- caudal: rostral border of orbit
- rostral: facial tuberosity
- dorsal: line from medial orbit to infraorbital foramen
- ventral: line from zygomatic arch to facial tuberocity
Extension of maxillary sinus in cow:
lacrimal bulla
connects each middle ear to the nasopharynx and allows air to pass b/t the tympanic cavity and ouside of body
auditory tube
dilation of auditory tubes in horse?
guttural pouches
How many guttural pouches do equine have?
2 Right and left separated by thin septum
what bone incompletely divides each guttural pouch into medial and lateral compartments?
stylohyoid
T/F. the medial and lateral compartments of the guttural pouch do not communicate.
F. communicate freely
What nn. are located close to the medial guttural pouch?
CN 9-12
What a. is located close to the medial guttural pouch?
internal carotid a.
What n is located close to the the lateral guttural pouch?
Facial n.
What a. is located close to the lat. guttural pouch?
external carotid
What is guttural tympany?
when guttural pouch fills with air
inability of air to escape through pharyngeal opening of auditory tube
What lymph nodes are located just ventral to the guttural pouch?
retropharyngeal
