72 
THOMPSON YATES LABORATORIES REPORT 
the anterior border was at least two centims. lower than in the others, and the evidence that the 
posterior border of the field did actually attain the mid-ventral line was not convincing. 
2. Motor Root. Vth cervical, i&ee Conspectus, p. 114, infra.) 
The method of examination adopted for the motor root was, as above explained, section of 
the motor roots adjoining that to be examined, then, after a lapse of at least 14 days, excitation 
with the faradic current of the remaining sound root in the vertebral canal, and of the various 
nerve-trunks composing the brachial plexus. 
On the motor root of the Vth cervical nerve four such experiments were carried out, one 
on M. sinicus, the rest on M. rhesus. 
The root was found to be distributed to the following muscles : — • 
Dorsal primary division : erector spina and transverso-spinales. 
f longus colli, 
rhomboidei. 
levator anguU scapula, 
serratus magnus. 
pectoralis major (clavicular portion only). 
deltoideus (clavicular and acromial portions). 
teres tninor. 
supraspinatus, 
infraspinatus, 
suhscapularis. 
scalenus medius. 
bicep (both heads). 
brachialis anticus. 
coraco-brachialis (slightly only). 
supinator longus (feebly), and brevis (very feebly). 
extensor carpi radialis longior (feebly ; in one experiment not at all). 
extensor carpi radialis hrevior (feebly ; in two experiments not at all). 
diaphragma : degeneration heavy in both sternal (ventral) and vertebral 
(dorsal) divisions of the phrenic on diaphragm. 
1^ suhclavius. 
Ventral primary 
division 
