金丝猴(RHINOPITHECUS)脑的外部形态

本文是对三种金丝猴脑的外部形态的观察结果表明:金丝猴的大脑皮层除存在猴科固有的全部沟裂外,还较其他猴科动物具有更多的副沟。大脑的沟型与疣猴亚科的特征完全吻合,但是很多特点都较叶猴更近似于长臂猿。另外,除了蚓叶和蚓结节较小,四叠体的下丘较猕猴发达以外,金丝猴的小脑和脑干均与猴科的一般特征无明显差异。

THE BRAIN OF THE SNUB-NOSED MONKEY (RHINOPITHECUS)

The gross features of the brain of three species of Snub-nosed monkeys (Rhinopi-thecus bieti, R. roxellamate and R. brelichi) distributing in China, were examined with particular reference to the fissural patterns of the cerebral cortex. It was found that the brain of Rhinopithecus exhibits typical cercopithecids characteristics and the cerebrum especially exhibits the typical colobine sulcal pattern as follows : (1) The course of the reetus sulcus is relatively straight and does not diverge much from the orbit while both the intraparietal and lunate sulci arched. (2) The paths of the Sylvian and superior temploital sulci are relatively parallel. (3) Both the paroc-cipitalis and the superior branch of the lateral calcarine suleus are present. (4) The fronto-orbitalis is infrequently present while occipitotemporal sulcus is not visible in lateral views. In comparison with the other cercopithecids,the fissural pattern of Rhinopitheeus is more complex than that of Presbytis, Macaca and many other genus of cercopithecids. Thus the observations here in noted and the relevant comment made on them led to the inference that among all the cercopitheeida the snub-nosed monkey probably shows the highest cerebral development. The cerebellum of Rhinopithecm is similar to those of other cercopithecids, but it has the lesser size of the folium and tuber when compared with Macaca and Presbytis. The brain-stem does not cal for any special remarks.