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CT sinuses - Ana tomy DarreapY Objec tives Function of the paranasal sinuses Anatomy of paranasal sinuses CT interpretion of these atomy P a ranasa l sinuses Air-filled spaces located within the and facial bonesll 4 sets of sinus Func tion • Lightening the weight of the head • Supporting immune defence of the nasal ca vity • Humidifying inspired air • Hea ting inspired air • Increasing resonance of the voice Maxilla ry Sinus Largest paranasal sinus Lies within the maxillary bone Inferior to the eye First sinus to develop at birth Biphasic growth pa ttern (0-3 y/0 ; 6-12 y/0) Maxilla ry Sinus Shape like a pyramid Base along nasal wall Apex pointing lateraly towards zygoma Natural osmium - superior portion of the medial wall Maxilla ry Sinus Roof - floor of the orbit Infra-orbital nerve runs along the roof Sensation to the cheek Thinnest portion Canine fossa - above canine tooth Maxilla ry Sinus Postero-medially Pterygopalatine fossa Neurovascular structures Internal maxillary artery Poteolaterally - infra temporal fossa Innervated second division of trigeminal nerve Infraorbital nerve / greater palatine nerve Fron ta l Sinus Contained within frontal bones Funnel-shaped with osteum a t the inferior aspect of the cavity Posterior wall separate sinus from anterior cranial fossa Fron ta l Sinus Last sinus to pneuma tize Upward growth of anterior ethmoid cells after age of 2 y/o Innerva ted by supraorbital and supratrochlear nerve of the first division of the trigeminal nerve Sphenoid Sinus Pneuma tize in the sphenoid bone Doesn t arise from an outpouching of the nasal cavity but nasal embryonic lining There is a variable degree of pneuma tization and thickness of the wall Sphenoid Sinus Supplied by sphenopala tine artery Innerva ted by branches of the 1st and 2nd division of trigeminal nerve Osteum drain anteriorl y into spheno-ethmoidal recessSphenoid sinus Ethmoid sinus Arises within ethmoid bone Form distinctive air cells between the eyes Bounded by middle turbina te medially and orbital wall laterally Air cells are divided by thin septa Ethmoid sinus Air cell can extend into:- Above orbit - supraorbital air cell Lateral and superior to sphenoid - sphene-ethmoidal cell Below orbit / roof of maxillary sinus - infraorbital ethmoidal cell Above frontal sinus - Interna tional frontal sinus ana tomy classification (IFAC) Ethmoid sinus Air cell can extend into:- Above orbit - supraorbital air cell Ethmoid sinus Air cell can extend into:- Lateral and superior to sphenoid - sphene- ethmoidal cell Ethmoid sinus Air cell can extend into:- Below orbit / roof of maxillary sinus - infraorbital ethmoidal cell Ethmoid sinus Air cell can extend into:- Above frontal sinus - International frontal sinus anatomy classifiction (IFAC) Ethmoid sinus Superiorly - cribriform pla te References https:/emedicine.medscape.com/ article/1899145-overview https:/www.researchgate.net/figure/CT-anatomy-of-the-pterygopalatine-fossa-asterisk-A- An-axial-image-showing-a_fig1_320469988 https:/www.radiologymasterclass.co.uk/ tutorialsct/ct_brain_anatomy/ ct_brain_anatomy_sinuses https:/br.pinterest.compin/haller-cells-aka-infraorbital-ethmoidal-air-cells-or- maxilloethmoidal-cells-they-are-extramural-ethmoidal-air-cells-that-extend-into-the- i--425590233532270065/? amp_client_id=CLIENT_ID(_)&from_amp_pin_page=true&mweb_unauth_id={{defaul t.session} }