64 EXPRESSION. 
corrugator supercilit as an opponent of the frontals, 
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 orbicularis, and denies its 
power to corrugate the eyebrow.’ Henle, highly 
elaborate, describes it as part of the ordicularis, 
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.”? But he 
also describes as part of the occipzto-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 the frontalzs, its 
1Tuschka, Anatomie des Menschen, iii. p. 365. 
2Henle, Anatomie des Menschen, Muskellehre, p. 143. 
3Ibid. p. 136. 
