. Cunningham's Text-book of anatomy. Anatomy. 800 THE ORGANS OF SENSE. In white races this index is below 70 (leptorhines); in yellow races, between 70 and 85 mesorhines); and in black races, above 85 (platyrhines). CAKTILAGINES NASI. Eive chief cartilages are concerned in the formation of the nose; they are the lateral and greater alar cartilages on each side and the cartilage of the septum. Cartilago Nasi Lateralis.—The lateral cartilage (Figs. 669, 670) is triangular in shape and is situated immediately below the nasal bone. Its posterior edge is thin and is attached to the maxilla and the
. Cunningham's Text-book of anatomy. Anatomy. 800 THE ORGANS OF SENSE. In white races this index is below 70 (leptorhines); in yellow races, between 70 and 85 mesorhines); and in black races, above 85 (platyrhines). CAKTILAGINES NASI. Eive chief cartilages are concerned in the formation of the nose; they are the lateral and greater alar cartilages on each side and the cartilage of the septum. Cartilago Nasi Lateralis.—The lateral cartilage (Figs. 669, 670) is triangular in shape and is situated immediately below the nasal bone. Its posterior edge is thin and is attached to the maxilla and the nasal bone; its anterior edge is thick and its superior part is directly continuous with the cartilage of the septum ; its inferior margin is joined by fibrous tissue to the upper edge of the greater alar cartilage. Cartilago Alaris Major.—The greater alar cartilage (Figs. 668, 669, 670) encircles the anterior part of the nostril and assists in keeping it open. It consists Frontal air-sinus Nasal bone Perpendicular lamina of ethmoid Cartilage of septum Medial crus of left greater alar cartilage Vomero-nasal cartilage. Palatine bone Fig. 668.—View op Nasal Septum from the Left Side. of a lateral and a medial crus, which are continuous with each other in a rounded angle at the apex of the nose. The lateral crus is oval in shape and is attached to the lateral cartilage, and the maxilla by fibrous tissue. Above and behind it are two or three lesser alar cartilages, while sometimes a horizontal furrow cuts off a narrow linear part from its superior margin. The inferior edge of the lateral crus does not descend as far as the opening of the nostril, the ala being here devoid of cartilage and composed of fatty and connective tissue covered with skin. The medial cms (Fig. 668) bounds the medial wall of the nostril and lies in the septum mobile, below the anterior part of the cartilage of the septum. The medial crura of the two cartilages are separated, in front, by a notch which c
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectanatomy, bookyear1914
