Quain's elements of anatomy . rane ofthe several sinuses which communicate with the nasal fossae. The pitui-tary membrane, however, varies much in thickness and vascularity in 472 THE NOSE. different parts. It is thickest and most vascular over the turbinatebones (particularly the inferior) and on the septum nasi it is also verythick and spongy ; but in the intervals, between the turbinate bones, andover the floor of the nasal fossge, it is considerably thinner. In themaxillary, frontal, and sphenoidal sinuses, and in the ethmoidal cells, thelining mucous membrane is very thin and pale, and co
Quain's elements of anatomy . rane ofthe several sinuses which communicate with the nasal fossae. The pitui-tary membrane, however, varies much in thickness and vascularity in 472 THE NOSE. different parts. It is thickest and most vascular over the turbinatebones (particularly the inferior) and on the septum nasi it is also verythick and spongy ; but in the intervals, between the turbinate bones, andover the floor of the nasal fossge, it is considerably thinner. In themaxillary, frontal, and sphenoidal sinuses, and in the ethmoidal cells, thelining mucous membrane is very thin and pale, and contrasts strongly withthat which lines the nasal fossse. The character of the epithelium varies in different parts, and by thisin a general way, three regions of the nasal fossae may be , the region of the external nostrils (the vestibule), including allthe part which is roofed by the nasal cartilages, is lined with stratifiedsquamous epithelium ; and the remainder is divisible into two parts, Fig. Fig. 413.—Outer wall of the left nasal fossa, covered by the pituitary MEMBRANE (Amold). f 1, frontal bone; 2, left nasal bone ; 3, superior maxillaiy ; 4, body of the sphenoidwith the sphenoidal sinus ; 5, projection of the membrane covering the upper spongy-bone ; 6, that of the middle; 7, that of the lower ; the upper, middle, and lowermeatuses are seen below the corresponding spongy bones; 8, opening of the Eustachiantube ; 9, depression of the lining membrane of the nose in the anterior palatine canal. the upper or olfactory region in which the epithelium is non-ciliated andcolumnar, and the lower or respiratory region in which, as also in thesinuses, it is ciliated and columnar. The membrane in the respiratorypart covers the inferior turbinate and all the lower portions of thefossas, and is studded with numerous racemose glands (yielding in partmucus, in part a more watery secretion), which open by orifices apparenton the surface. They are most nu
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