1888.] On the Motor Functions of certain Cranial Nerves. 269 



June 7, 1888. 



Professor Gr. G. STOKES, D.C.L., President, in the Chair. 



The Presents received were laid on the table, and thanks ordered 

 for them. 



The following Papers were read : — 



L* "Note on some of the Motor Functions of certain Cranial 

 Nerves (V, VII, IX, X, XI, XII), and of the three first 

 Cervical Nerves, in the Monkey (Afacacus sinicus)" By 

 Charles E. Beevor, M.D., F.R.C.P., and Victor Horsley, 

 B.S., F.R.S. (From the Laboratory of the Brown Institution). 

 Received May 16, 1888. 



In the course of an investigation which we are making into the 

 cortical representation of the muscles of the mouth and throat, we 

 .have experienced considerable difficulty in describing correctly the 

 movements of these parts, especially when there was any question of 

 bilateral action occurring. 



On referring to text-books we failed to find any solution of this 

 difficulty, and we therefore determined to make a few observations of 

 the movements evoked by stimulating the several cranial nerves 

 supplying this region in the monkeyf so as to have a definite basis 

 whereon to ground our observations of the movements obtained by 

 stimulating the cortex. 



In the course of this work we have observed several facts which do 

 not harmonise with the views hitherto generally received. 



The results are summarised as follows : — 



Method of Investigation. 



The foregoing summary of our experiments is based almost 

 entirely upon the results obtained by exciting the respective nerves 

 at the base of the cranial cavity after separating them from the 

 bulb. 



We nave also stimulated the nerves outside the skull in the neck 

 both before and after division. 



* Towards the expenses of this research a grant was made by the British Medical 

 Association, on the recommendation of the Scientific Grant Committee of the 

 Association. 



f Previous observers having employed animals of lower order?. 



T 2 



