Nasal cavity/paranasal sinus Flashcards
boundaries of nasal cavity
external nares to the choanae
what are the choanae and clinical significance
- passageways between the nasal cavity and the nasal pharynx
- choanal atresia
what is the vomer
choanae are on either side of the ventral edge
what is the nasal diverticulum and clinical significance
- false nostril
- cutaneous pouch lateral to the nasal cavity
- allows extreme dilation of the nostril (flaring)
how do the paranasal sinuses form
invasion of nasal epithelium between the external and internal plates of the skull
probable functions of paranasal sinuses
- give a large head with light weight
- protection
- resonance for vocalization
what species have large palatine sinus and what does it communicate with
- ruminants
- communicates with maxillary sinus
what serves as a partial barrier between the palatine and maxillary sinuses
infraorbital canal
what is the lacrimal bulla and significance
- in ruminants at the caudal end of the maxillary sinus
- barrier at the end of the maxillary sinus
what is the prominent external landmark of the equine maxillary sinus
facial crest
compare/contrast rostral and caudal maxillary sinuses and their communication
- caudal communicates with frontal sinus via frontal-maxillary opening
- rostral separated from caudal by perpendicular plate (bony septum) and opens into nasal cavity via nasomaxillary opening
in what 2 species does the frontal sinus cover the entire brain case
ox and pig
what is the significance of the equine frontal sinus in removal of the last molar tooth
frontal sinus is the site of a trephine hole where a punch is passed through to reach the last molar tooth
what is the fronal maxillary opening and which species have it
horses - opening between the chonchofrontal sinus and the caudal compartment of the maxillary sinus
how is the chonchofrontal sinus formed
by an extension of the frontal sinus into the dorsal concha
