MUSCLES INNERVATED BY THE FIFTH CRANIAL NERVE. 593 
On the Afferent Ganglionated Nerve-fibres of 
the Muscles Innervated by the Fifth Cranial 
Nerve; and on the Innervation of the Tensor 
Veli Palatini and Tensor Tympani. 
By 
F. II. £flg:e worth, M.D., 
Professor of Medicine, University of Bristol. 
With Plates 33 to 36. 
It was shown by Sherrington that the skeletal muscles 
innervated by the spinal nerves receive afferent nerve-fibres 
from the posterior nerve-roots as well as efferent nerve-fibres 
from the anterior roots. These afferent nerve-fibres come 
from cells in the spinal root ganglia, and constitute from 
one third to one half of the myelinate fibres in any muscular 
nerve-trunk. On the other hand, the external ocular muscles 
do not receive any ganglionated nerve-fibres, and the direct 
fibres which pass to them are efferent-afferent (Sherrington, 
Sherrington and Tozer, Dogiel). 
It is of interest to inquire whether the muscles innervated 
by the fifth cranial nerve resemble the skeletal muscles 
innervated by the spinal nerves in receiving ganglionated 
afferent nerve-fibres, or whether they resemble the external 
ocular muscles in not receiving such nerve-fibres. 
The subject has already been investigated, with very diverse 
conclusions. 
Sappej'' (’72) stated that Palleta, Louth and Longet, “ ne 
voieut dans cette union ” — of the motor and sensory parts of 
the mandibular division of the fifth cranial nerve — “ qu’un 
