Larynx, (Including Vocal Cords),
Lungs,
Muscles of Respiration.
_LARYNX._
The larynx is the principal organ of voice. It is situated in the front
of the neck, and forms the prominence sometimes called “Adam’s apple”;
it also forms a part of the anterior boundary of the pharynx. At the
upper part it has the form of a triangular box, with one angle directly
in front. It is composed of nine cartilages moved by muscles, and lined
with mucous membrane. Six of its cartilages are in pairs; three are
single. The three single cartilages are the thyroid, cricoid, and
epiglottis; the three pairs are the arytenoid, cuneiform, and cornicula
laryngis. The larynx is sometimes called a music-box; from it proceeds
the sound called voice.
[Illustration: =SIDE VIEW OF THE LARYNX AND TWO RINGS OF THE TRACHEA.=]