Practical.
1. Feel in your own person the parts of the larynx, etc., from above down.
2. Note the vibration of the larynx when a vowel is spoken or sung. A similar vibration of the chest walls may be felt by the hands laid over them.
3. Note the change of position of the larynx in singing a scale.
4. Dissect a pig's or sheep's pluck and some specimens of the larynx.
Fig. 35. These three figures illustrate perhaps more clearly the action of the muscles indicated Figs. [26]-34.
The arrows show the direction of the pull of the muscles. The result of this action is the new position of the cartilages and vocal bands, which is shown by red outlines. The muscle is also depicted in red. The heavier outer rim is to indicate the thyroid cartilage. By comparing the upper and the lowest figure it will be seen that they are opposites. Of course, in phonation the vocal bands are never so much separated as shown in the illustrations. Rather does the lower figure indicate a case of extreme separation due to a very deep inspiration. However, these illustrations are merely diagrams meant to indicate in a general way the manner of the working of parts. For exact pictures of the vocal bands and related parts, see [Chapter VII].