Proceedings of the Association of American Anatomists III 



NOTE ON THE CLASSIFICATION OF CERTAIN OF THE FACIAL MUS- 

 CLES. By J. Playfaib McMubbich. Anatomical Laboratory, Uni- 

 versity of Michigan. 



In the B. N. A. list of myological terms there is recognized among 

 the facial muscles a M. quadratus labii superioris, credited with three 

 heads of origin, a caput zygomaticiim, a caput infraorbitale and a caput 

 angulare. These three heads correspond to what have been elsewhere, 

 and especially in the English text-books, recognized as distinct muscles, 

 the zygomaticus minor, the levator labii superioris proprius and the 

 levator labii superioris alaeque nasi. 



There can be no question but that the B. N. A. terminology for this 

 group of muscles presents from the aesthetic standpoint decided advan- 

 tages; but that is not the standpoint from which a classification of 

 muscles should be made. If the morphological standpoint, as is proper, 

 be taken, then it is clear that the B. N. A. grouping is quite artificial 

 since it is known from the observations of Ruge that, while the caput 

 zygomaticum and the caput angulare are derivatives of the superficial 

 layer of the muscle sheet which gives rise to the facial muscles and may 

 be regarded as differentiations of the orbicularis oculi, the caput infra- 

 orbitale, on the contrary, is derived from the deep layer and may be re- 

 garded as a differentiation from the orbicularis oris. 



A BONY SUPRACONDYLOID FORAMEN IN MAN, WITH REMARKS 

 ABOUT SUPRACONDYLOID AND OTHER PROCESSES AT THE 

 LOWER END OF THE HUMERUS. By Thomas Dwight. Anatomi- 

 cal Department, Harvard Medical School. 



A supracondyloid foramen completely bounded by bone, observed in 

 a white woman, was described. No other such case has been recorded. 



The median nerve went through the foramen, the artery over it. This 

 foramen did not have the appearance of an ossification of a band of con- 

 nective tissue occurring late in life, but was probably laid down in car- 

 tilage. The early ossification of the supracondyloid processes points to 

 this as does the shape of the arch in this case and an observation of Tand- 

 ler's. 



A process from the anterior border of the humerus was described, in 

 connection with which was discussed Solger's views, according to which 

 it would be a middle or anterior supracondyloid process. Barkow's ex- 

 ternal process was discussed, the difficulty of its interpretation consid- 

 ered and the conclusion reached that it is probably of no significance. 

 The difficulty of accounting for supracondyloid processes and similar 

 anomalies on the theory of reversion alone was considered. 



