What are the three types of conchae found in the nasal cavity of birds?
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Rostral concha, middle concha, caudal concha.
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What are the three types of conchae found in the nasal cavity of birds?
Rostral concha, middle concha, caudal concha.
What is the location of the tube in the ventral meatus?
The tube is located in the ventral meatus of the nasal cavity.
What types of glands are found in the lamina propria of the nasal cavity?
Mucous and serous glands.
What type of epithelium is found in the respiratory system?
Pseudostratified, ciliated and columnar epithelium with goblet cells.
What is a notable feature of the middle meatus in cattle?
Cattle have a very small middle meatus. Much larger ventral meatus
What are the thin-walled veins in the nasal cavity referred to?
Cavernous bodies.
What is external nasal aperture stenosis?
External nasal aperture stenosis is a condition characterized by the narrowing of the external openings of the nasal cavity, which can lead to breathing difficulties.
What type of cells are found in the olfactory region?
Olfactory cells.
Where should a nasal tube be correctly placed in cattle?
In the ventral meatus.
What is a significant feature of horses' nostrils that improves airflow?
Horses have a significant ability to distend their nostrils.
What are the non-motile structures in the olfactory region called?
Cilia-like structures.
Where is the incorrect placement of a nasal tube in cattle?
In the middle meatus.
What do olfactory receptors detect?
Chemicals.
What are the characteristics of the nostrils in pigs?
Pigs have small nostrils on a flat mobile snout that are highly sensitive.
What are the types of nasal conchae mentioned?
Dorsal concha, Middle concha, Ventral concha.
What are the paired caudal openings of the nasal cavity called?
Choanae
What covers most parts of the nasal cavity?
Respiratory mucosa covers most parts of the nasal cavity.
Which cranial nerve is associated with the olfactory region?
Cranial nerve I (Olfactory nerve).
What is the primary function of the muscles of the nostrils in horses?
Nostril dilation.
What are the four main functions balanced in the nasal cavity?
Airflow resistance, defence mechanisms, warming and moistening function, and olfaction.
What bone is contained in the snout of pigs?
The rostral bone is contained in the snout of pigs.
How do the lengths of the middle concha differ among species?
Short in horse and pig, longer in dogs and ruminants.
What is the singular form of choanae?
Choana
What are the three separate passages that the nasal conchae divide the nasal cavity into?
Dorsal, ventral, and middle meatus.
What are the components of the mucosa in the nasal cavity?
The mucosa consists of epithelium and lamina propria.
What are the nasal conchae covered by?
Nasal mucosa
Which muscles are involved in nostril dilation in horses?
Levator nasolabialis (biggest muscle), Caninus, and Transversus nasi (Between two nostrils - pull axial part together)
How does the nasal cavity structure vary between species?
It varies considerably; for example, horses have a simple structure while dogs have a complex structure.
What are the functions of the nasal cavity related to air preparation?
The nasal cavity moistens, warms, filters particles, and traps particles in mucus which are then swallowed.
To which bone are the dorsal and middle conchae attached?
Ethmoid bone.
What type of epithelium is found in the vestibule of the nasal cavity?
Stratified squamous epithelium
What is the transition area from integument (skin) to mucous membrane in the nasal cavity called?
Vestibule
How does the complexity of the nasal meatus differ between horses and dogs?
It is simple in horses and more complex in dogs.
How are the nasal conchae structured?
They consist of long thin bone coiled up like a paper roll.
What is the nasal vestibule?
The opening of the nasal cavity.
What nerve innervates the muscles responsible for nostril dilation in horses?
The facial nerve.
How does the nasal cavity function as a heat exchanger for the brain?
Airflow cools venous blood, and the subsequent countercurrent flow with arteries cools arterial blood going to the brain.
What type of epithelium lines the respiratory region of the nasal cavity?
Respiratory epithelium
What is the extent of the nasal cavity?
The nasal cavity extends from the nostrils to the cribiform plate of the ethmoid bone.
What are nasal conchae?
Scrolls of turbinate bone covered in mucosa that further increase nasal surface area.
What type of epithelium is found in the nasal cavity?
Respiratory epithelium
What type of epithelium is found in the nostrils of cattle?
Stratified cornified epithelium
What structure's opening is contained in the nasal vestibule?
The opening of the nasolacrimal duct.
What are the nostrils also known as?
Nares
What divides the nasal plate in dogs and cats?
The nasal plate is divided by the median groove, known as the philtrum.
Which artery supplies the muscles involved in nostril dilation in horses?
The facial artery.
What role does the olfactory epithelium play in the nasal cavity?
The caudal regions of the turbinates are covered by olfactory epithelium, which is involved in the sense of smell.
What type of epithelium is associated with the olfactory region of the nasal cavity?
Olfactory epithelium
How is the nasal cavity divided?
The nasal cavity is divided into left and right sides by the nasal septum. Further divided by nasal conchae
What is the significance of the vascular nature of the nasal conchae?
The highly vascular nature of the nasal conchae helps in warming and humidifying the air.
Which part of the nasal cavity contains olfactory epithelium?
Caudodorsal part of the ethmoidal conchae
What bones are located dorsally in nasal osteology?
Nasal bones
What is the formula for calculating airflow resistance?
Resistance = length / radius^4, meaning that halving the radius increases resistance by 16 times.
What are the dorsal borders of the nasal cavity?
Nasal bones.
In which species is the opening of the nasolacrimal duct especially visible on the ventral surface of the nasal vestibule?
In horses.
What surrounds the nostrils?
Hairless skin
What surrounds the nostrils of cattle?
Smooth hairless nasolabial plate
What is the source of secretions in the nasal plate of dogs and cats?
Secretions come from the lateral nasal gland.
What type of cartilage is absent in the horse's nasal structure?
No ventral nasal cartilage.
What are ethmoturbinates and where do they extend from?
Ethmoturbinates extend rostrally from the ethmoid bone.
What is the singular form of 'conchae'?
Concha.
How many nasal meatus are present in horses?
There are four nasal meatus in horses. (dorsal, middle, common, ventral)
What organ is associated with olfaction in the nasal cavity?
Vomeronasal organ
Which bones are found laterally in the nasal structure?
Incisive bones and Maxilla
What forms the ventral border of the nasal cavity?
Hard palate.
What do nasal glands in dogs secrete into the nasal vestibule?
Nasal gland secretions.
What supports the nostrils?
Nasal cartilages
What type of glands create moisture in the nostrils of cattle? What is the name of the type of mucous / fluid produced?
Nasolabial glands. Serous
What anatomical structures are found in the canine and equine skulls related to the nasal cavity?
Nasal conchae are present in both canine and equine skulls.
What type of epithelium covers the ethmoturbinates?
The ethmoturbinates are covered with respiratory epithelium.
What is the function of the dorsal meatus in horses?
The dorsal meatus leads to the olfactory mucosa.
Why do horses have less complex turbinates?
Horses are obligate nasal breathers and have less complex turbinates to reduce airflow resistance.
What characterizes the nostrils of horses?
They have distensible nostrils.
Which bones are located laterally to the nasal cavity?
Incisive bone and maxilla.
What bones are located ventrally in nasal osteology?
Palatine bones
What are the glands called that are associated with the nasolabial area in cattle?
Nasolabial glands
To what are the nasal cartilages attached?
Nasal septum
What do the ethmoturbinates contain besides respiratory epithelium?
The ethmoturbinates also contain olfactory sensory neurones.
What anatomical alignment aids airflow in horses?
Flow is aided by a straighter head-neck-thorax alignment.
What is the primary type of epithelium found in the nasal cavity?
Respiratory epithelium
What shapes do the alar cartilages form in horses?
Comma shaped nostrils.
Which nasal meatus connects to the paranasal sinuses in horses?
The middle meatus connects to the paranasal sinuses.
What is located rostrally to the nasal cavity?
Nares (nostrils).
Which bone is found caudally in the nasal structure?
Ethmoidal bone
How does sniffing affect airflow in relation to the ethmoturbinates?
Sniffing alters the normal airflow to bring the air into contact with the ethmoturbinates.
What is the vomeronasal organ?
An accessory olfactory sense organ contained within the hard palate, featuring unique chemoreceptors distinct from other olfactory organs.
What is the layer of connective tissue beneath the respiratory epithelium called? What other structures are present?
Lamina propria. Capillary net, nasal glands, venous cavernous bodies, artery
What are the two types of nostrils found in horses?
Ventral 'true' nostril and dorsal 'false' nostril.
What percentage of airflow resistance is caused by the nasal cavity, pharynx, and larynx?
They cause more than 60% of airflow resistance.
What does the ventral meatus lead to in horses?
The ventral meatus leads to the pharynx.
What is the caudal boundary of the nasal cavity?
Nasopharynx.
What is the axial structure in nasal osteology?
Nasal septum
What role does the vomeronasal organ play?
It may play a role in pheromone detection.
Describe the location and structure of dorsal 'false' nostril in horses
Skin lined diverticulum, within nasoincisive notch
What is the name of the bone layer that covers the nasal cavity?
Periosteum
What is the common meatus in horses?
The common meatus is one of the four nasal meatus, but its specific function is not detailed.
What structure is found axially in the nasal cavity?
Nasal septum.
What behavior is associated with the vomeronasal organ's function?
Lip curling, known as the Flehmen response.
Where is the vomeronasal organ located?
It is contained within the hard palate.
What is Brachycephalic Obstructive Airway Syndrome (BOAS)?
A condition affecting flat-faced breeds of cats and dogs characterized by anatomical abnormalities that obstruct airflow.
What are common anatomical features associated with BOAS in flat-faced breeds?
Stenotic nares (short nose holes), elongated and thickened soft palate, enlarged tongue, and narrow trachea.
How does BOAS affect the quality of life in affected animals?
It leads to increased breathing noise, coughing, shortness of breath, sleep apnoea, and exercise intolerance.
Describe the nares of birds
Slit-like openings (except diving birds eg gannets) with operculum (overhanging bony flap)
Five functions of respiratory epithelium
Regulation of air flow by erectile tissue. Cleaning (cilia), humidification (evaporation), warming (variable blood perfusion), protecting reflexes (sneeze reflex)
