You have seen the
diagram above left before. The red line in the middle represents the
septum running down the middle of the inside of the nose, and the black line
represents the side walls of the nose. The
three-dimensional representation is above right.
Since the cross
section at left is basically shaped like a triangle, and the three-dimensional
diagram looks like a stretched-out pyramid, this main portion of the nose, all
of the nose except the tip, is called the pyramid of the nose. The upper
part, which is made of bone and colored blue in the diagram above right, is called the
bony pyramid, and the lower part, which is made of cartilage and colored brown, is
called the cartilaginous pyramid.
So we have divided
the nose into three main sections: The bony pyramid, the cartilaginous pyramid, and
the tip. The cartilaginous pyramid and the tip are both made out of
cartilage.
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