In his teeth Man differs by the small exaggeration of the canines, which hardly, if at all, differ in the two sexes. There is also a complete absence of a diastema. The teeth are also on the whole weaker than in the Anthropoids, though Hylobates is very human in this particular.
Fig. 285.—Human Larynx in frontal section. cr, Cricoid cartilage; sn, sinus of Morgagni; t.c, first tracheal cartilage; th, thyroid cartilage. (From Wiedersheim's Structure of Man.)
There is a tendency in Man towards the disappearance of the upper outer incisors, and more markedly still of the wisdom teeth, which appear very late, and are often imperfect. In a large number of cases the tooth does not appear at all. In the larynx there is no great development of the great throat pouches of the Anthropoids. The minute diverticula of that organ, known to human anatomists as the ventricles of Morgagni, alone remain to testify to a former howling apparatus in the ancestors of Man.
