The proportions of the head in teen-agers are almost identical with adults; the difference is largely a matter of feeling. In boys thfc bone structure has become quite evident, though it should not be stressed as much as in men's heads. There are no noticeable lines. The flesh is firm and still inclined to smoothness. The cheeks are smooth without much definition of the muscles. The jaw has developed considerably in a short time. The bridge of the nose has taken permanent shape. As the jaw and cranium have grown, the ears appear smaller in relation to the whole head than they do in a little boy. The cartilage of the ear is now well defined; the ears have lost much of their roundness and taken on more angular lines.
The hair has moved back somewhat from the temples. The brows have definitely thickened. The lips are fully developed in size. The chin has come forward in permanent shape.
The only bone not fully developed is the corner of the jaw. This continues to develop, research shows, until the age of twenty or more. I suspect the cranium itself does not reach its maximum growth until full maturity, though further growth does not perceptibly affect the proportions of the head.
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