Differences of the Voicebox, or Larynx, in Children, Women, and Men
The voicebox of a newly-born baby is about one-third the size of that of a grown woman. It is therefore rather large in proportion to other parts of the body, with the exception of the head, which comparatively is larger still. The horizontal outline of the shield cartilage is a very gentle curve, and the upper horns are short, in consequence of which the voicebox is close to the tongue. The wedges, according to Merkel, are strongly developed; the vocal ligaments are short and thick, and the pockets deep. Up to the third year the voicebox grows very considerably, but no particular alterations take place from that time to the period of puberty, which generally occurs at the age of 14 or 15, rather earlier in girls than in boys. This period of change lasts from six to twelve months, or sometimes even two or three years. During this time the vocal organs undergo a marked change. In boys, the angle at which the two plates of the shield meet becomes more and more acute, and the length of the vocal ligaments increases only in the proportion of five to ten. In girls, on the other hand, the horizontal outline of the shield does not lose its evenness, and the length of the vocal ligaments increases only in the proportion of five to seven. The cartilages would seem, especially in boys, to grow more rapidly than the muscles, so that the slowly-growing muscles do not, at first, control the newly-developed cartilages. This accounts for the unmanageable state of the voice at this period. The changes which take place in the female voicebox are very imperceptible, so that they do not materially affect the character of the voice. In the male voicebox, on the contrary, the alterations are very marked, and the result is that the high voice of the boy is changed into the tenor or the bass of the man. While, therefore, before the period of puberty the voicebox is materially the same in both sexes, there are, afterwards, considerable differences noticeable, not only with regard to size, but also with regard to shape. This seems, indeed, sufficiently obvious, and any one can see it by simply comparing the outside of the throat of a man with that of a woman.
Nevertheless we are told by Mr. Lunn L that “Anatomy teaches us that there is no difference between the male and female larynx save in size;” and by Dr. Garrett (on page 13 of the book quoted before) that “The male larynx does not differ anatomically in the least from that of the female, except in size.”
My readers may judge for themselves whether these statements are borne out by facts or not.
It must further be observed that the whole upper part of the shield in the female voicebox is less developed than in the male. The upper horns are short, so that the voicebox is more closely attached to the tongue-bone, and its position in the throat is altogether higher in woman than in man. To show more clearly still the difference in the proportions of the male and the female voicebox, I give below some average measurements (taken from Luschka’s great work on the Larynx) which I have, for the convenience of English readers, reduced, as nearly as possible, from centimetres and millimetres to inches.
| Male. | Female. | ||
| Height of the voicebox in front, with the lid raised | ]- | 2 4/5 in. (7 cent.) | 1 9/10 in. (4.8 cent.) |
| Greatest width between the plates of the shield cartilage | ]- | 1 3/5 in. (4 cent.) | 1 2/5 in. (3.5 cent.) |
| Depth between the lower border of the shield cartilage, and the opposite point of the ring cartilage. | ]- | 1 1/5 in. (3 cent.) | 1 in. (2.4 cent.) |
| Length of the vocal chink... | 1 in. (25 mm.) | 3/5 in. (15 mm.) | |
According to this eminent anatomist, therefore, the differences between male and female larynges are as follows: In height, 9/10; in width, 1/5; in depth, 1/5; in the length of the vocal chink, 2/5 of an inch. As it is plain that if there were “no difference between the male and the female larynx save in size,” all their proportions would be alike, I think I may safely assume that I have proved my point, which is a rather important one, as the reader will see when the registers in the male and female voice come up for discussion.
We will now consider the question how the various classes of voice—i.e., Sopranos, Contraltos, Tenors, and Basses—are to be accounted for by corresponding differences in the voicebox. We know that tone is produced by the vibrations of the vocal ligaments. It is clear, therefore, that a voice will be high or low according to the number of vibrations which the ligaments are capable of producing, or in other words, according to their dimensions and their tension. This difference is easily seen by comparing the voicebox of a soprano with that of a bass, because there the proportions are so manifestly smaller in the one than in the other. There are similar distinctions between soprano and contralto on the one hand, and between tenor and bass on the other, but they are not so striking. Neither can they, for various reasons, be demonstrated with the laryngoscope; but they exist nevertheless.
It is true that the vocal ligaments of a soprano are sometimes longer than those of a contralto, just as the ligaments of a tenor are occasionally longer than those of a bass. But I maintain that the longer ligaments of sopranos and tenors are correspondingly thinner, and that their tension is greater, owing to the ring-shield or stretching muscles being more powerful than their opponents—the shield-pyramid muscles. Where this is the case the ligaments are more slanting than they would be otherwise, and the consequence of this is that less power of blast is required to make them speak. With this mechanism the higher registers are very readily united with the lower ones, and the voices so produced are of a light and flexible kind. Where, on the contrary, the vocal ligaments of contraltos and basses are comparatively short, they are also thick in proportion, and the shield-pyramid muscles are more powerful than the opposing ring-shield muscles, so that there is less tension. I shall be asked how I can prove this tension theory, and my reply is this: The diameter of the vocal ligaments depends in a large measure on the magnitude of the shield-pyramid muscles. If, therefore, the ligaments are exceptionally thick, the muscles just named must of necessity be very powerful, and can easily resist the pulling of the ring-shield muscles. If, on the contrary, the ligaments are exceptionally thin, it is equally certain that the shield-pyramid muscles are weak in proportion, and then the stretching muscles can easily overcome their resistance.
I may add that I came to the above conclusions about the various classes of voices years ago, when commencing the study of this subject. Not only have I never since seen any reason to alter my views—although I have not failed to notice and carefully examine the theories of others denying my doctrine—but I am more than ever convinced that my explanations are correct. I have now the gratification of seeing my theory confirmed by so great an authority as Dr. Merkel, of Leipzig, who most elaborately explains the subject in his latest work on the larynx, to which I have already alluded in these pages.
Besides the factors enumerated above, there are, no doubt, others which are also of consequence in determining the particular kind of voice to be produced by this vocal apparatus or by that; as, for instance, the windpipe, or the resonator, or both. The capacity of the chest—nay, the structure of the whole body, may have a more or less direct influence upon it. But there are absolutely no statistics to proceed upon, and in the absence of these it is vain to indulge in any speculations on the subject.