Human anatomy, including structure and development and practical considerations . aterially reduced in size by the thickness of themucous membrane and the erectile tissue that cover the bony framework. Tlie Superior Meatus.—Corresponding to the small size of the upper turbinate,the superior meatus (meatus nasi superior), or etiinioidal fissure, is narrow andgroo\e-like and little more than hilf the length of the middle one. It is directeddownward and backward and is floored by the convex upj)er surface of the middleconcha. When the upper turbinate is replaced by two scrolls (conchae superioret
Human anatomy, including structure and development and practical considerations . aterially reduced in size by the thickness of themucous membrane and the erectile tissue that cover the bony framework. Tlie Superior Meatus.—Corresponding to the small size of the upper turbinate,the superior meatus (meatus nasi superior), or etiinioidal fissure, is narrow andgroo\e-like and little more than hilf the length of the middle one. It is directeddownward and backward and is floored by the convex upj)er surface of the middleconcha. When the upper turbinate is replaced by two scrolls (conchae superioret suprema)—a condition that Zuckerkandl regards as very frequent, if indeed, notthe more usual—the meatus is accordingly doubled. Into the upper and front partof the superior meatus the posterior ethmoidal air-cells open by one or more orifices Fig. 1175. Frontal sinusProbe in iiifundibulum Middle turbinate, partlyremoved Hiatus semilunarisEthmoidal buUa- Openings Agger nasi of niaxillarv sinus into infuiidiburum \entric!i. Limen nasi Vestibule Probe in naso-lachrymalduct. Opening of middle ethmoidal cells Superior turbinate, partly removed Opening into spheno-elhmoidal recess Sphenoidal sinus Opening of posteriorethmoid cells superior meatus T~~Naso-pharynx Opening of Eustach-ian tube Inferior meatus Inferior turbinate,partly removed Middle meatus Lateral wall of nasal fossa ; portions of turbinate bones have been removed to exposeopenings into air spaces. of variable size. Above and behind the upper turbinate and in front of the body ofthe sphenoid bone lies a diverticulum, the spheno-ethmoidal recess, into the posteriorpart of which opens the sphenoidal sinus. The Middle Meatus.—The recess beneath the middle turbinate (meatus nasimcdhis) is spacious and arched to conform with the contour of the middle andinferior conchae which constitute its roof and floor respectively. On elevating,or still better removing close to its attachment, the middle turbinate bone, a
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Keywords: ., bookauthormc, bookcentury1900, bookdecade1910, booksubjectanatomy
