Opening near the anterior end of the crista galli The anterior bone of the skull which underlies the foreheadĪrticulates with the parietal bone posteriorly zygomatic, ethmoid and sphenoidīones inferiorly maxilla, nasal and lacrimal bones anteriorly it is formedįrom two ossifications centers which normally fuse in the midline - if theyĭo not fuse, a midline "metopic suture" is the resultįlat portion of frontal that forms the roof of the orbitĪ very thin portion of the frontal bone which is like an egg shell in thickness Sinus posteroinferiorly, and the openings of the anterior ethmoidal air cells Receives the frontonasal duct anterosuperiorly, opening of the maxillary Process below and bulla ethmoidalis above Groove in the ethmoid portion of the lateral nasal wall between the uncinate Transmits posterior ethmoidal vessels and nerve Transmits anterior ethmoidal vessels and nerve In the middle nasal meatus), posterior (drain into the superior nasal meatus) In the middle nasal meatus), middle (drain onto the apex of the bulla ethmoidalis Three groups may be identified: anterior (drain into the hiatus semilunaris Pneumatized spaces (3-18 in number) within the ethmoid bone located between Located under cover of the middle nasal concha middle ethmoidal air cells Rounded elevation on the lateral wall of the nasal cavity Overlies the bulla ethmoidalis and hiatus semilunaris) below it Portion of the ethmoid bone that projects inferomedially from the lateralįorms the superior nasal meatus above it and the middle nasal meatus (which Medial projection of the ethmoid bone from the superolateral wall of theįorms the superior nasal meatus below it and the sphenoethmoidal recess Midline process projecting inferiorly into the nasal cavityįorms the superior part of the bony nasal septum "cock's comb" anterior anchor point of the falx cerebri Superior midline projection of the ethmoid bone into the anterior cranialįossa it arises between the cribriform plates Perforated for passage of the olfactory nerves Perforated portion of ethmoid bone on either side of the crista galli Highly pneumatized bone that contains the ethmoid air cells forms the fragile Small cartilaginous nodule located in the aryepiglottic foldĬuneiform cartilage is yellow elastic cartilageĮpiglottic cartilage is covered by a mucous membraneĭelicate bone located between the two orbits The lamina connected below to the first tracheal ring via the cricotracheal Ring its arch projects anteriorly and its lamina is broad and flat posteriorlyĬonnected: above to the thyroid cartilage via the inferior horn of the thyroidĬartilage, to the conus elasticus, to the arytenoid cartilages which sit atop The inferior & posterior cartilage of the larynx it forms a complete cartilaginous and to the thyroid cartilage anteriorly via the vocal ligament paired arytenoid cartilages are pulled together (adducted) by the arytenoid m.Ī small cartilage located on the apex of the arytenoid cartilageĬorniculate cartilage is found in the base of the aryepiglottic fold it Paired each is connected to the epiglottis above via the aryepiglottic m. A pyramid shaped cartilage located on the superior margin of the cricoid lamina
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