paranasal sinuses anatomy

chapter 11 - part A

______________ are air filled cavities, located in ethmoid, sphenoid and maxillary of face

paranasal sinuses

4 groups of paranasal sinsuses:

frontal, ethmoid, sphenoid, and maxillary sinuses

paranasal sinuses communicate with ___________

nasal cavity

frontal bone has how many pockets:

2 pockets

ethmoid bone has how many pockets:

many pockets

sphenoid bone has how many pockets:

one pocket

maxillary bone has how many pockets:

2 pockets

serve as a resonating chamber for the voice

decrease weight of skull

aid in warming and moisturizing inhaled air

act as shock absorbers in trauma

possibly control the immune system

functions of paranasal sinuses

___________ do not fully develop until 17 to 18 years of age

ethmoids

by 6 to 7 years of age, ___________ and _____________ are distinguishable from ethmoids

frontal; sphenoid

_________________ are usually the only ones developed enough to be demonstrated radiographically at birth

maxillary sinuses

_________ are within maxilla

maxillary sinuses

largest and most symmetric, paired bones

maxillary sinuses

located above upper teeth

maxillary sinuses

_____________ are visible when in erect position

air-fluid levels

_______________ vary in size and shape, but usually pyramidal in frontal view, and more square from side view

maxillary sinuses

the bony walls on maxillary sinuses are very _______

thin

the site of communication between sinuses and nasal cavity is the opening into the middle of _____________

nasal meatus

second largest sinus:

frontal sinuses

______________ are located between vertical plates of frontal bone

frontal sinuses

frontal sinuses are rarely __________

symmetric

larger in men than women

frontal sinuses

______________ are within lateral masses of labyrinths of ethmoid bone

ethmoid sinuses

three collections of ethmoid sinuses:

anterior, middle and posterior

ethmoid sinuses communicate with _______________ and ________________

sphenoid sinus; nasal cavity

anterior ethmoid sinuses fill orbits bc portions are contained in lateral masses which form _____________

medial wall of orbit

_____________ is located below sella turcica

sphenoid sinus

sphenoid sinuses are _________, only one develops, may be 2, but no more

asymmetric

_____________ can be used to indicate basal skull fracturee

sphenoid sinus

what paranasal sinuses are divided into three groups?

ethmoid

the only facial bones that contain paranasal sinuses are:

maxillae