Human anatomy, including structure and development and practical considerations . mucous membrane clothingthe ethmoidal cells is exceedingly thin, but corresponds in its general structure,even in possessing glands, with that lining the respiratory region of the adjacentnasal fossa-. The Sphenoidal Sinus.— The paired air-spaces (sinus sphenoidalcs) producedby the absorptit)n of the cancellated tissue within the body of the sphenoid bone areseparateil by an osseous partition and seldom communicate. They are very variablein size and often asymmetrical, with corresponding displacement of the septu
Human anatomy, including structure and development and practical considerations . mucous membrane clothingthe ethmoidal cells is exceedingly thin, but corresponds in its general structure,even in possessing glands, with that lining the respiratory region of the adjacentnasal fossa-. The Sphenoidal Sinus.— The paired air-spaces (sinus sphenoidalcs) producedby the absorptit)n of the cancellated tissue within the body of the sphenoid bone areseparateil by an osseous partition and seldom communicate. They are very variablein size and often asymmetrical, with corresponding displacement of the septum. Alength of 22 mm., a width of 15 mm., and a height of 12 mm., are the approximatedimensions of the average sinus. The capacity of the latter, as determined by Briihl,is from 1-4 cc. When large, the spaces may appropriate not only a large part ofthe sphenoid, extending into both wings, the pterygoid processes and the rostrum,but also include the basilar process of the occipital bone. Not infrequently one or FiG. Anterior ethmoidal cell Probe passes to middle meatus. Sphenoidal sinuses Pituitary body Openings of sphenoidal sinusand posterior ethmoidal cells Internal carotid arterj- Portion of section of frozen formalin-hardened head, exposing ethmoidal and sphenoidal air-spaces; viewed from above. more of the posterior ethmoidal air-cells projects or opens into the sphenoidal exceptionally these spaces may come into close relations with or even open intothe maxillary antrum (Zuckerkandl)—a condition normally found in some sphenoidal sinus of each side communicates with the nasal fossa by means ofthe spheno-ethmoidal recess, above the superior turbinate and close to the roof ofthe fossa, by an aperture that pierces the upper part of the anterior wall of the this opening, reduced in the recent condition, the respiratory mucousmembrane is prolonged into the sinus which it lines. The palatal sinus, the small air-space within the orbit
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Keywords: ., bookauthormc, bookcentury1900, bookdecade1910, booksubjectanatomy
