Flashcards in Nose Deck (75):
Bony nasal aperture
Rostral opening of the nose
Separates nostrils from each other
Apex of nose is what type of epidermis?
Thickened cornified epidermis
Glands in apex of nose
None in dog
Surface of nasal plane is moistened by?
Secretion of lateral nasal gland
What is nasal cartilage?
Support of external nose → moveable
5 nasal cartilages
1. Septal c. of nose
2. Dorsolateral nasal c.
3. Ventrolateral nasal c.
4. Lateral accessory nasal c.
5. Medial accessory nasal c.
Septal c. of nose
Perpendicular medial plate separating most of nasal cavity into right and left nasal fossae
Dorsolateral nasal c.
Most expansive c. in mobile part of external nose → joins dorsal part of bony nasal aperture caudally
Ventrolateral nasal c.
Continuation of rostral lateral half of septal c. → rostrally runs into apex of nose
Lateral accessory nasal c.
Supports nostril ventrally
Medial accessory nasal c.
Arises from ventral nasal concha and ventrolateral nasal c. → extends rostrally inside alar fold
2 lig. of nose
1. Dorsal nasal lig.
2. Lateral nasal lig.
Which lig. of nose is paired?
Lateral nasal lig. (one of each side)
Ligs. of nose run from ___ to?
Dorsolateral nasal c. → nasal b. (dorsal or lateral surfaces)
Nasal cavity extends from ___ to ?
Nostrils → chonae
Parts of nasal cavity
1. Nasal septum
3. Nasal vestibule
4. Nasal conchae
4. Nasal meatuses
3 portions of nasal cavity
1. Osseous portion
2. Rostral and cd. cartilagenous portions
3. Membranous portion
Borders of osseous portion of nasal septum
Caudally: ethmoid b.
Dorsally: frontal and nasal b.
Ventrally: vomer b.
Which cartilaginous portion of nasal cavity is movable?
Origin of cd. cartilaginous portion of nasal cavity
Nostril is wider ____
Dorsomedialy than ventrollateraly
Wing of nostrils contains?
Much of dorsolateral and accessory nasal cc.
Most mobile portion of nostril
Wing of nostrils
Nasal vestibule is the common opening for the?
1. External nose
2. Nasolacrimal duct
2. Duct of the lateral nasal gland
Nasal vestibule houses?
What is alar fold?
Rostral extension of ventral nasal concha
Cartilagenous (or slightly ossified) scrolls covered by nasal mucosa → occupy most of nasal cavity
3 nasal conchae
1. Dorsal nasal conhae
2. Ventral nasal conchae
3. Middle (ethmoidal) nasal conchae
Dorsal nasal concha originates from?
Ethmoid crest of nasal b.
Dorsal nasal concha extends from ? to ?
Cribiform plate → nasal vestibule
Dorsal nasal concha is formed by?
Longest concha in domestic mammals
Dorsal nasal concha
Ventral nasal conch originates from?
Conchal crest of maxilla
Ventral nasal concha extends from ? to ?
1st premolar tooth → 3rd premolar tooth
Ventral nasal concha is arranged in?
Many longitudinal folds which unite rostrally to form alar fold
Ethmoidal nasal concha aka?
Middle nasal concha
What fills cd. part of nasal cavity?
Ethmoidal (middle) nasal conchae
Ethmoid nasal concha is formed by?
Ethmoidal nasal choncha is part of?
Ethmoidal labyinth are outgrowth of?
Ethmoid b. covered with nasal mucosa
All ethmoidal labyrinths are attached to?
External lamina and cribiform plate of ethmoid b.
The major conchae divide the nasal cavity into what 3 nasal meatuses?
1. Dorsal nasal meatus
2. Middle nasal meatus
3. Ventral nasal meatus
Dorsal nasal meatus is the passage between?
Nasal b. (ventral surface) → dorsal nasal concha
Dorsal nasal cavity leads directly to?
Fundus of nasal cavity
Middle nasal meatus is the passage between?
Dorsal and ventral nasal conchae
Middle nasal meatus communicates ith?
Ventral nasal meatus is the passage between?
Ventral nasal conchae → hard palate (dorsal surface)
Main pathway for airflow
Ventral nasal meatus
Clinical correlation of ventral nasal meatus
1. Nasogastric tube
Nasogastric tube and endoscope are both pointed?
Medially and ventrally
Ventral nasal meatus leads into?
Nasopharyngeal meatus extends between?
Ventral nasal meatus and chonae
Which wall of nasopharyngeal meatus is longer?
Lateral > medial
Borders of nasopharyngeal meatus
Dorsal: ethmoid b. (transverse lamina)
Ventral: palatine b. (horizontal lamina)
Nasopharyngeal meatus leads into?
What is the common nasal meatus?
Longtidunal space on either side of nasal septum
Common nasal meatus communicates with?
All other nasal meatus
What are paranasal sinuses?
Air-filled cavities between external and internal lamina of bb. of skull
3 paranasal sinuses
1. Frontal sinus
2. Sphenoid sinus
3. Maxilary recess
Frontal sinus is located where?
Rostral 2/3 of frontal b.
Compartments of frontal sinus
Largest compartment of frontal sinus
Smallest compartment of frontal sinus
The 3 components of the paranasal sinuses do/do not communicate with each other
Each compartment of the paranasal sinus opens separately into?
Nasal cavity via space between 2nd and 3rd ectoturbinates
Larger in cat (very small or not present in dog) → contains part of endoturbinate IV
What is a recess?
Something with is not an air-filled cavity between external and internal lamina of skull bb.
Borders of maxilla
Lateral: maxilla, lacrimal and palatine bb.
Medial: ethmoidal b. (orbital plate)
Does size of maxillary recess vary with increasing age of animal?
Nasomaxillary opening is the connection between ? and?
Middle nasal meatus → maxilary recess