The superficial lateral muscles of the neck in Macaca cyclopis (Formosan monkey).

The purpose of the present study was the determination of the standard anatomical condition of the superficial lateral muscles of the neck in Macaca cyclopis (Formosan monkey). Since the first study by Schack the superficial lateral muscles of the neck in monkey have been the subject of comparatively many anatomical investigations. The majority, however, had been based upon a small number of cases so that the conclusions based upon the findings of such studies were prone to error due to the influence of anomalies and individual variations. This problem can not be overcome nor can the determination of the normal condition be achieved without the systematic examination of as many cases of the same species as possible and the statistical analysis of the findings. A study of Macaca cyclopis is in progress in this department from this standpoint under the supervision of Professor Satoh in which statistical consideration is given to the results from the examination of a large number of cases in an attempt to determine the standard condition of various organ' systems. The present study was made as part of the project. The material in the present study consisted of 25 bodies of Macaca cyclopis (12 males and 13 females) selected at random from the collection of Professor Satoh. These specimens had been fixed in formalin and preserved in this department. Gross anatomical inspection of each side of the body was made in as much detail as possible using a dissecting knife and tweezers to determine the origin, insertion, nerve supply and relationships of the muscles. The minute portions were examined with the use of a loupe.