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Updated: April 30, 2025
As the air rushes past the glottis, which is still partially closed, a sound recalling the whoop of pertussis is heard. Often this recurs throughout all the burst of crying which follows, and each inspiration is accompanied by a shrill stridulous sound. With the re-establishment of respiration the cyanosis rapidly fades, to be succeeded in some cases by pallor and perspiration.
The shape assumed by the lips, which are capable of many exquisite variations in shape, conditions the form of the air-column as it enters the cup of the trumpet or horn. This I believe to be one important function performed for the larynx by the vocal cords, which Mackenzie, with an aptness he could not have appreciated, called the lips of the glottis.
No one can ever forget the sight presented by the left cord in its helpless condition: the arytenoid, tipped with its cartilage of Santorini, extending far over the median line of the glottis and drawing after it the right vocal cord in a vain endeavor to put it in position where it can aid its injured mate.
It must be observed that neither the stroke nor the slide of the glottis can be shown to have any influence in causing the laryngeal muscles to adopt any particular mode of adjustment. Turning to practical methods of instruction, little connection can be traced between the theories of attack and the occasional directions usually given for starting the tone.
With every loosening, tightening, lengthening or shortening of the vocal cords or other effect of muscular action upon them, the space between them the glottis alters in size and shape. These subtle changes in the size and shape of the glottis are, as I shall expect to show, of great importance in voice-production. They form the first step in the actual creation of voice.
Child-crowing, or spasm of the glottis, or spurious croup, as it is sometimes called, is occasionally mistaken for genuine croup. It is a more frequent disorder than the latter, and requires a different plan of treatment Child crowing is a disease that invariably occurs only during dentition, and is most perilous, indeed, painful dentition is the cause the only cause of child crowing.
Many facts regarding the voice have been observed so continually that they are a matter of common knowledge, and yet these facts have never been recorded in a scientific manner. Consider, for example, this remark about a famous singer, made by one of the foremost musical critics of the United States: "Mme. T 's lower medium notes were all sung with a pinched glottis."
The mind not only moves the externals in these ways but the internals, too, in their whole series, outmosts from inmosts and inmosts from outmosts. Thus while moving the mouth to speak, it moves lungs, larynx, glottis, tongue and lips at the same time, each separately to its especial function, and the face suitably also.
On the other hand, the shrike's larynx, including the glottis, is a clumsy affair, whereas the mocker's larynx is indeed wonderfully made. It must not be supposed, however, that the syrinx does not perform an important function in the production of avian melody. It acts as a regulator or meter of the air impelled from the lungs.
We can thus, as I infer from Professor Owen's interesting description of these parts, understand the strange fact that every particle of food and drink which we swallow has to pass over the orifice of the trachea, with some risk of falling into the lungs, notwithstanding the beautiful contrivance by which the glottis is closed.
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