the voluntary muscles with the brain. 165 
operations did not possess that exquisite sensibility which the 
profusion of the sensitive nerves would imply, or which the 
skin really possesses. 
Still dissection did not authorise this conclusion. I traced 
the sensitive nerves into the substance of the muscles : I found 
that the fifth pair was distributed more profusely to the 
muscles than to the skin ; and that estimating all the nerves 
given to the muscles, the greater proportion belonged to the 
fifth or sensitive nerve, and the smaller proportion to the 
seventh or motor nerve. On referring to the best authorities, 
as Meckel,* and my excellent preceptor Monro, the extre- 
mities of the fifth were described by them as going into the 
muscles, so that of this fact there cannot be a doubt. 
Having in a former Paper demonstrated that the portio 
dura of the seventh nerve was the motor of the face, and that 
it run distinct from the sensitive nerve, the fifth, and observing 
that they joined at their extremities, or plunged together into 
the muscles, I was nevertheless unwilling to draw a con- 
clusion from a single instance ; and therefore cast about for 
other examples of the distribution of the muscular nerves. It 
was easy to find motor nerves in combination with sensitive 
nerves, for all the spinal nerves are thus composed ; but we 
wanted a muscular nerve clear in its course, to see what 
alliance it would form in its ultimate distribution in the 
muscle. I found in the lower maxillary nerve the example 
I required. 
The fifth pair, from which this lower maxillary nerve 
comes, as I have elsewhere explained, is a compound nerve ; 
that is to say, it is composed of a nerve of sensation, and a 
* Meckei. de quinto pare nervorum cerebri. 
