Nose Flashcards
What is the internal structure of the nasal cavity ?
Roof
Floor
Medial wall-nasal septum
Lateral wall of the nasal cavity
what is the function of the nose?
Warm, moisten and filter air before it goes into the lungs
Respiration, olfaction, filtration of dust, humidification of inspired air, receive secretions from paranasal sinuses and lacrimal ducts
What are the 3 parts of the roof of the nasal cavity
- frontonasal
- sphenoidal
- ethmoidal
What is the floor of the nasal cavity formed by?
- palatine process of the maxilla
* horizontal plate of the palatine bone
What is the medial wall of the nasal cavity formed by?
The nasal septum ( part bony and part cartilaginous
What are the 3 main components of the nasal septum?
- Vomer
- Septal cartilage
- Perpendicular plate of the ethmoid bone
What is the function of the conchae?
To increase the membrane surface area with which air contest into contact
What are paranasal sinuses?
Paired, air filled cavities in bone that is lines with Mucous membrane just like nasal cavity
What is the function of paranasal sinuses?
Lighten skull bones
Act as sound resonators
Provide Mucous for nasal cavity
What are the 4 paranasal sinuses?
Frontal
Maxillary
Ethmoidal
Sphenoidal
What does the frontal sinus drain ?
Middle meatus
What are properties of maxillary sinus?
Largest of the paranasal sinuses
Pyramidal in shape
What does the maxillary sinus drain
Middle meatus
What is so special about the ethmoidal sinuses?
Honeycomb structure
Made up of various small cavities in the ethmoidal labyrinth
What does the ethmoidal sinus drain?
Anterior group drains middle meatus
Posterior group drains superior meatus
What are features of the sphenoidal sinus?
Paired and located in the body of sphenoid bone
Drains into the roof of the nasal cavity via apertures on the posterior wall of the spheno-ethmoidal recess
Deep into the skull therefore important nerves around it
What makes up the superior and middle conchae?
Ethmoid bone
What makes up the inferior nasal conchae?
It has its own bone
What is primary sinusitis ?
Involves allergies or an infection occurring in the sinus
What is secondary sinusitis ?
Dental origin- occurs mainly in the maxillary sinus because maxillary teeth are in close proximity to the floor of the maxillary sinus
What can secondary sinusitis result from ?
If a fracture occurs in one of the roots during removal of a maxillary molar tooth and proper retrieval method are not used, the broken piece root may be driven superiority into the maxillary sinus. This may introduce oral bacteria into the sinus creating maxillary sinusitis
The spread of infection from a peri apical abscess initiated by a maxillary posterior tooth that perforates the sinus floor to involve the sinus mucosa