Larynx
The larynx, or voice box, is located at the superior portion of the trachea near the base of the tongue. It projects from the anterior mid line of the surface of the neck (Adam's apple). The larynx is composed of a number of cartilaginous pieces bound by membrane and muscle. It is placed high in the necks of females and children. During male puberty, the larynx enlarges in all dimensions thus creating a deeper voice. The vocal folds, or true vocal cords, are two white shelves of mucous membrane. Tension, elasticity, and rigidity of the vocal folds are factors which effect the pitch of the voice; the folds are controlled by a highly efficient set of muscles. The volume of sound during speaking or singing, on the other hand, is varied by change in the thoracic and abdominal regions.
References
Gray, H. 1977. Gray's Anatomy. Crown Publishers, Inc, New York. 1257 pp.
Lockhart, R.D., G.F. Hamilton, et. al. 1974. Anatomy of The Human Body. Faber and Faber Limited. London. 697 pp.
Van Amerongen, C. The Way Things Work; Book Of The Body. New York: Simon and Schuster, 1979.
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