Quiroga J C
J Hirnforsch. 1979;20(4):341-50.
The endocasts of the cynodonts Massetognathus sp. and cf. Probelesodon are studied from descriptive and quantitative viewpoints. The morphology of the casts is described briefly, doing special attention to those features that import to the quantitative analysis, as for instance the general appearance of the casts and some vascular impressions. The general conclusions of this study are: 1.--Massetognathus sp. has had a brain with rather long olfactory peduncles and perhaps not greatly developed olfactory bulbs which could imply a non-macroosmatic condition, up to date not known for cynodonts. Cf. Probelesodon, on the other hand, shows a brain type similar to those of other cynodonts. 2.--Certain cynodonts at least, have had brains that filled fairly well the endocranial cavity. 3.--The cynodonts Massentognathus sp. and cf. Probelesodon, as surely other species, have acquired in Middle Triassic times a relative brain size rather closed to that of certain fossil and living mammals.
从描述性和定量的角度对犬齿兽类的马塞托颌兽属（Massetognathus sp.）和疑似原前颌兽（cf. Probelesodon）的脑腔模型进行了研究。简要描述了模型的形态，特别关注那些对定量分析有重要意义的特征，例如模型的总体外观和一些血管压痕。本研究的总体结论如下：1.——马塞托颌兽属的大脑嗅柄相当长，嗅球可能发育不太充分，这可能意味着一种非大嗅觉的状况，这在犬齿兽类中至今尚未知晓。另一方面，疑似原前颌兽显示出一种与其他犬齿兽类相似的脑型。2.——至少某些犬齿兽类的大脑相当好地填充了颅腔。3.——马塞托颌兽属和疑似原前颌兽，肯定还有其他物种，在三叠纪中期获得了与某些化石和现存哺乳动物相当接近的相对脑容量。
