. The anatomy of the human body. Human anatomy; Anatomy. THE PITUITARY MEMBRANE. 643 The free •portion of the cartilage is thick and triangular; it has Fig- 232. the same direction as the bony septum, and presents tivo lateral surfaces, covered by the pituitary membrane ; an anterior margin, of which the upper half (c, fig. 231) is blended with the lateral cartilages along the dorsum of the nose, while its lower half is free, convex, directed downward, and received between the two cartilages of the nostrils ; a superior and posterir margin, which is extremely thick and rough, and is intimately
. The anatomy of the human body. Human anatomy; Anatomy. THE PITUITARY MEMBRANE. 643 The free •portion of the cartilage is thick and triangular; it has Fig- 232. the same direction as the bony septum, and presents tivo lateral surfaces, covered by the pituitary membrane ; an anterior margin, of which the upper half (c, fig. 231) is blended with the lateral cartilages along the dorsum of the nose, while its lower half is free, convex, directed downward, and received between the two cartilages of the nostrils ; a superior and posterir margin, which is extremely thick and rough, and is intimately united to the corre- sponding margin of the perpendicular plate of the ethmoid bone (e, fig. 232): the mode in which this union is effected is not by articulation, but by a continuity of tissue, like that between the costal cartilages and the ribs ; lastly, an inferior margin, which is received between the two plates of the vomer (»). The groove into which it is received is very deep ; and as the two plates of the vomer become more and more separated in extending forward, so does the corre- sponding margin of the cartilage increase in thickness ; hence the lower extremity of the septum frequently projects considerably into one or other of the nostrils. The caudal prolongation of the cartilage of the septum may be seen by carefully exam- ining the retreating angle formed by the perpendicular plate of the ethmoid and the vo- mer ; in which situation the cartilage of the septum gives off a considerable prolonga- tion, in the form of a band, which occupies the interval between the two plates of the vomer, and is attached to the rostrum of the sphenoid bone. This cartilaginous band is contained entirely within the substance of the middle portion of the bony septum: its upper margin is thin, and, as it were, toothed; the loioer margin is thick and rounded. The two naso-palatine nerves are situated in the same canal as the cartilage, and are placed one on each side of it. The musc
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