It
should be mentioned that Aikin and many other good authorities do not hold
this view.
[Illustration: FIG. 7 A-A', Ring cartilage. B, Shield cartilage. 1, Pyramid
cartilage. 2, Vocal process, with 2', its position after contraction of
muscle. 3, Postero-external base of pyramid, giving attachment to abductor
and adductor muscles at rest, with 3', its new position after contraction
of the muscles. 4, Centre of movement of the pyramid cartilage. 5, The
vocal cords at rest. 5', Their new position after contraction of the
abductor and adductor muscles, respectively seen in I and II. 6, The
interligamentous, with 7, the intercartilaginous chink of the glottis. 8,
The arrow indicating respectively in I and II the action of the abductor
and adductor in opening and closing the glottis.]
[Description: FIG. 7.--Diagram after Testut (modified), showing: (i.) the
action of the abductor muscle upon the pyramid cartilages in separating the
vocal cords; (ii.) the action of the adductor muscles in approximating the
vocal cords.]
[Illustration: FIG. 8]
[Description: FIG. 8.--Diagram after Testut (modified) with hinder portion
of larynx and windpipe cut away, showing the conical cavity of the
sound-pipe below the vocal cords.
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