nasal cavity, paranasal sinuses and horns Flashcards
function of the nasal cavity
warm and humidify air going to lungs
filter particles from air and lungs
detect odour molecules in air
form of the nasal cavity
divided into 2 fossae by nasal septum
made up of ethmoid bone caudally and cartilagenous sheet for the remaining rostral 2 thirds
majority of space in nasal cavity taken up by turbinate bones of nose and spaces between them
function of nasal turbinates
increase surface area of nasal cavity
what are nasal turbinates
thin scrolls of bone originating from the nasal and maxillary walls
what are the 3 main groups of nasal turbinates
ethmoturbinates
dorsal turbinate
ventral turbinate
ethmoturbinates
small and lie towards back of nasal cavity = 30 of them
dorsal turbinate
single scroll attached to nasal wall
ventral turbinate
double scroll attached to maxilla
terminology for turbinates in horses
concha - single
conchae - plural
form of the paranasal sinuses
air-filled diverticula of nasal cavity
invaginate several bones of the skull
continuous with nasal cavity and lined with nasal epithelium
what is the paranasal sinuses prone to due to retaining connection with nasal cavity via narrow openings
blockage by inflammation or congestion
innervation of paranasal sinuses
same as nasal cavity - branches of ophthalmic and maxillary divisions of trigeminal nerve
functions of paranasal sinuses
mechanical protection
thermal protection
enlarge skull without adding weight so provides greater surface area for muscle attachments and allows for a large oral cavity to accommodate teeth
what are the main sinuses of clinical importance
frontal and maxillary
form of horns in ruminants
arise from cornual process of frontal bone
base of horn invaded by frontal sinuses
