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MR/CT Sinuses/Facial
| Question | Answer |
|---|---|
| 4 sets of sinuses | frontal, ethmoid, sphenoid, & maxillary |
| actions of sinuses | - resonating chamber for voice - help warm & moisten inhaled air - act as shock absorbers in trauma situations - possible help in control of immune system |
| Acronym for Facial Bones | MVM NIPLZ |
| How many facial bones are there? | 14 |
| Which facial bones are not paired? | mandible & vomer |
| All 14 facial bones | mandible, vomer, maxilla (2), nasal bone (2), inferior nasal conchae (2), lacrimal (2), Palatine (2), zygoma (2) |
| action of facial bones | provide structure/support and shape for face |
| the bone between the orbits | ethmoid |
| smallest of the cranial bones | ethmoid |
| thin part of the ethmoid bone that contains foramina for passageway of olfactory nerves (allows for smell) - seen on axial | cribriform plate |
| what indicates inflammation of olfactory nerves? | bright signal |
| a bony projections on the superior portion of the cribriform plate (seen on coronal) - superior to perpendicular plate | Crista galli |
| provides attachment for connective tissue that anchors the brain anteriorly | crista galli |
| what could break the crista galli? | severe trauma or shaking |
| what would appear if the crista galli was broken? | CSF out of the nose along with bruising on the brain |
| bruising of the brain on the opposite side of an injury | contrecoup |
| the inferior portion of the cribriform plate that forms part of the nasal septum (helps separate the RT & LT nasal cavity) | perpendicular plate |
| another name for the perpendicular plate | vertical plate |
| 3-18 tiny air cells within the ethmoid bone (found on both RT and LT sides of nasal cavity) | ethmoid sinuses |
| are seashell shaped bones that help provide circulation & filtration of the inhaled air before it passes into the trachea & lung | superior and middle nasal conchae |
| which way do the superior and middle nasal conchae project from the ethmoid bone? | project from the lateral masses |
| scroll like shaped bones that extend diagonally & inferiorly from the lateral walls of the nasal cavity | inferior nasal conchae |
| forms the medial walls of the orbit and the floor of the nasal lacrimal duct; posterior to the nasal bones | lacrimal bone |
| 2 of which are fused together; form the upper bridge of the nose | nasal bones |
| thin, flat bone that extends from the hard palate and forms the posterior part of the nasal septum; articulates with the perpendicular plate of the ethmoid bone in forming the nasal septum | vomer |
| 2 L-shaped bones that form posterior part of the hard palate & help to form part of the nasal cavity floor | palatine bones |
| largest IMMOVABLE facial bones that help make up the upper part of the mouth & part of the hard palate | maxilla |
| where do the maxillary sinuses drain? | into the nasal cavity |
| commonly referred to as the cheek bones; lateral to the maxilla | zygoma |
| the largest MOVABLE bone in the face; commonly referred to as the jawbone | mandible |
| found in the frontal bone; 1-2 of which drain into the nasal cavity | frontal sinus |
| found in the sphenoid bone; 1-2 of which are just inferior to the sella turcica | sphenoid sinus |
Created by:
gnteumac
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