Nose Flashcards
What are the two main divisions of the nose?
a) external nose
b) internal nose
what is the external nose made of? (2)
1) bone
2) hyaline cartilage
what are the components of the external nose? (4)
1) nasal bone
2) maxillary bone
3) hyaline cartilage
4) nostrils
what is the size difference between the internal and external nose?
the internal nose is 3x larger than the external nose
F: nostril
opens into the nasal cavity
F; nasal vestibule
covered with hairs to prevent external objects from entering the nasal cavity
what are the components of the internal nose? (4)
1) nasal roof
2) nasal floor
3) posterior nasal aperture/choana
4) lateral wall
what are the components of the nasal roof? (3)
1) frontal bone
2) sphenoid bone
3) ethmoid bone
what passes through the ethmoid bone in the nasal cavity?
CN 1
How does CN1 pass through the ethmoid bone?
Cribriform plate of the ethmoid bone
F: nasal floor
separate the nasal cavity from the oral cavity
What forms the nasal floor? (2)
1) maxilla (anterior 2/3)
2) palatine bone (posterior 1/3)
What is the posterior nasal aperture/choana?
posterior opening between the nasal cavity and the pharynx
What are the components of the lateral wall? (4)
1) nasal conchae
2) nasal meatuses
3) sphenoid sinus
4) middle nasal septum
how many nasal conchae do we have?
Three
1) inferior concha
2) middle concha
3) superior concha
