anatomy of sinuses, orbit, mandible, and TMJ

4

how many sinuses are there

sphenoid, ethmoid, frontal, maxillary

what are the 4 sinuses

purpose of sinuses

help voice resonate, reduce weight of skull by containing air, warm and moisten inhaled air, shock absorbers in trauma, control immune system, mucous production, interconnected with nasal cavity

maxillary sinus

largest sinus

maxillary sinus

develops in fetus and fully developed and aerated at birth

maxillary sinus

approximately pyramidal, usually symmetric but can vary in size and shape, sinus floor corresponds to roots of teeth

maxillary sinus

communicates with middle nasal meatus at superior aspect

frontal sinus

2nd largest sinus, can be absent

frontal sinus

fully develop by 6-7, normally paired and rarely symmetrical,

located between vertical plates of frontal bone

where is the frontal sinus located

frontal sinus and anterior/middle ethmoid sinus

communicates with middle nasal meatus

ethmoid sinus

within the lateral masses of the labyrinths of the ethmoid, divided into anterior, middle, and posterior

ethmoid sinus

what sinus is the last to develop

posterior ethmoid sinus

communicates with superior nasal meatus

sphenoid sinus

occupy body of sphenoid, lies below Sella turcica and extend between dorsum sellae and posterior ethmoid air cells

sphenoid sinus

can be singular or paired, asymmetric, communicates with sphenoethmoidal recess of nasal cavity

sphenoid sinus

fully developed by 6-7

7

how many cranial/facial bones make up the orbit

37 degrees lateral, 30 degrees inferior

the optic canal is __________ from the MSP and ___________ as it passes through the sphenoid

frontal, sphenoid, ethmoid

what cranial bones make up the orbit

maxilla, zygoma, lacrimal, palatine

what facial bones make up the orbit

mandible

largest and densest of facial bones

mandible

only movable facial bone

temporal mandibular join

TMJ

hinge/gliding joint

what kind of joint is the TMJ

hyoid bone

u shaped structure at the base of the tongue, attachment of many muscles, easily palpated and seen on image