Flashcards in Sinuses Deck (198)
The paranasal sinuses are 4 groups of air containing cavities:
within the cranium: Ethmoid bone, sphenoid bone, and frontal bone. Within the facial bones: maxillary bone.
Each sinus communicates with:
the nasal cavity
Each sinus is lined with:
a mucous membrane.
Functions for paranasal sinuses are believed to be:
resonating chamber for voice.
decrease weight of skull.
warm and moisten inhaled air.
shock absorbers in trauma (like air bags)
possibly control immune system.
The paranasal sinuses begin to develop in the fetus, but only the ______ sinuses are demonstrated radiographically at birth.
______ & ________ sinuses are visible radiographically at 6 or 7 years old.
Frontal and sphenoid.
______ sinuses are fully developed by late teenage years
Maxillary sinuses are located:
in the body of each maxillary bone.
Older terms for maxillary sinuses include:
Antrum or Antrum of Highmore
The maxillary sinuses are shaped:
like pyramids in the front and cube-shaped from the side.
Infections starting within the first and second upper molar teeth can spread where? How?
Projecting in to the floor of each maxillary sinus are several conic elevations related to roots of the first and second upper molar feet. Infections in these teeth can therefore spread upward into the maxillary sinuses.
All paranasal sinuses communicate with:
each other and with the nasal cavity which is divided in to two fossae.
The site of communication in the maxillary sinuses is:
the opening to the middle nasal meatus passageway.
Because mucus or fluid trapped in sinuses tend to layer out and form an air-fluid level,
all radiographic positioning for sinuses should be performed in the upright position.
Frontal sinuses are located:
between the inner and outer tables of skull posterior to glabella
The frontal sinuses are rarely aerated before the age of:
The frontal sinuses vary in:
size and are occasionally absent.
Generally the frontal sinuses are two cavities separated by:
a septum, but may be one cavity.
The fontal sinuses are generally larger in:
Ethmoid sinuses are contained:
within lateral masses (labyrinths) of ethmoid.
The ethmoid sinuses are divided into three groups:
Anterior, middle, posterior. All intercommunicate.
Sphenoid sinuses lie in:
body of sphenoid directly below the sella turcica.
The sphenoid sinuses extend between:
posterior ethmoids and dorsum sella.
True or false? The sphenoid sinuses are paired.
True, but can be single. When paired, they are separated by a septum.
The sphenoid sinuses are very close to:
the base of the skull. Air-fluid levels could indicate basal skull fracture after trauma indicating blood or CSF is leaking through fracture into sphenoid sinus (sphenoid effusion)
The osteomeatal complex is:
the pathways of communication between the frontal, maxillary and ethmoid sinuses which provide drainage between them.
An obstructed osteomeatal complex leads to:
infection or sinusitis.
Osteomeatal complex can be imaged with:
The two key passageway of the osteomeatal complex are:
infundibulum and middle nasal meatus.