Muscles2 - Bones and Cartilages of the Head and Neck Listed...

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Bones and Cartilages of the Head and Neck - Listed Alphabetically Bone/Carti lage Structure Description Notes arytenoid cartilage a pyramid shaped cartilage located on the superior margin of the cricoid lamina paired; each is connected to the epiglottis above via the aryepiglottic m. and to the thyroid cartilage anteriorly via the vocal ligament; paired arytenoid cartilages are pulled together (adducted) by the arytenoid m. corniculate cartilage a small cartilage located on the apex of the arytenoid cartilage corniculate cartilage is found in the base of the aryepiglottic fold; it is yellow elastic cartilage cricoid cartilage the inferior and posterior cartilage of the larynx; it forms a complete cartilaginous ring; its arch projects anteriorly and its lamina is broad and flat posteriorly connected: above to the thyroid cartilage via the inferior horn of the thyroid cartilage, to the conus elasticus, to the arytenoid cartilages which sit atop the lamina; connected below to the first tracheal ring via the cricotracheal ligament cuneiform cartilage small cartilaginous nodule located in the aryepiglottic fold cuneiform cartilage is yellow elastic cartilage epiglottis the superior part of the larynx epiglottic cartilage is covered by a mucous membrane ethmoid delicate bone located between the two orbits highly pneumatized bone that contains the ethmoid air cells; forms the fragile medial wall of the orbit cribriform plate perforated portion of ethmoid bone on either side of the crista galli perforated for passage of the olfactory nerves crista galli superior midline projection of the ethmoid bone into the anterior cranial fossa; it arises between the cribriform plates "cock's comb"; anterior anchor point of the falx cerebri perpendicular plate midline process projecting inferiorly into the nasal cavity forms the superior part of the bony nasal septum superior nasal concha medial projection of the ethmoid bone from the superolateral wall of the nasal cavity forms the superior nasal meatus below it and the sphenoethmoidal recess above it middle nasal concha portion of the ethmoid bone that projects inferomedially from the lateral wall of the nasal cavity forms the superior nasal meatus above it and the middle nasal meatus (which overlies the bulla ethmoidalis and hiatus semilunaris) below it bulla ethmoidalis rounded elevation on the lateral wall of the nasal cavity located under cover of the middle nasal concha; middle ethmoidal air cells drain at its apex ethmoidal air cells pneumatized spaces (3-18 in number) within the ethmoid bone; located between the orbits three groups may be identified: anterior (drain into the hiatus semilunaris in the middle nasal meatus), middle (drain onto the apex of the bulla ethmoidalis in the middle nasal meatus), posterior (drain into the superior nasal meatus) ethmoidal foramen, anterior opening in the medial wall of the orbit transmits anterior ethmoidal vessels and nerve ethmoidal opening in the medial wall of the transmits posterior ethmoidal vessels and nerve
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