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It is generally found protruding from the anterior and middle third on one or the other side of the glottic opening, or on both, in chronic cases.

The "check glottid" or glottic shock, on the other hand, involves an undue effort of the vocal muscles, and the compression of the vocal cords causes irritation.

In this register the vocal cords still vibrate along their entire length, but as the voice progresses upward, they show a tendency to shorten the glottic chink, and the cup, as well as the adjustment of the entire vocal tract, tends to become less open.

In the course of time the automatic valvular action is supposed to become so well established that the singer can dispense with the glottic stroke in public performance.

The glottic chink can be seen from above or below, and should be observed from both view-points.