64 EXPRESSION. 



corrugator super cilii as an opponent of \hzfrontalis, 

 but the description of it is unsatisfactory. In the 

 eighth edition of Quain's Anatomy it is described, 

 according to the received mode, as proceeding 

 "outwards and a little upwards." Luschka des- 

 cribes it as a part of the orbictilaris, and denies its 

 power to corrugate the eyebrow. 1 Henle, highly 

 elaborate, describes it as part of the orbicularis, 

 and consisting " of two or three slips covering one 

 another in such a way that the higher they arise 

 they are the deeper, and pass more from a gentle 

 upward slope to a transverse direction." 2 But he 

 also describes as part of the ocdpito-frontalis* slips 

 passing upwards from an attachment to the frontal 

 process of the superior maxillary bone. So far as 

 I can see by dissecting the frontalis, pyra-midalis, 

 and corrugator muscles from the deep aspect, a 

 much simpler description would be more accurate, 

 as well as more in accord with what may be made 

 out by examining carefully the movements of the 

 integument during life. I am disposed to describe 

 together the muscular fibres passing upwards from 

 the superior maxillary bone and inner end of the 

 superciliary ridge as a sheet which widens as it passes 

 upwards inseparably connected with \ktfrontalis, its 



1 Luschka, Anatomic des Menschen, iii. p. 365. 



2 Henle, Anatomic des Menschen, Muskellehre, p. 143. 



3 Ibid. p. 136. 



