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Material. 
During the course of the foregoing research, the following mam- 
mals have been dissected: 
Cervus canadensis . . . . .. . Wapiti. 
Connochaetes Bug rar . 4. °Gnu: 
Cervus: porting ae eee |.) Lop deer: 
Gazella. dores ne 2 2 yo S. .Gazelle: 
Dieotylesate aeg 2 Er sehen. 2 - Peccary. 
Camel dromedarius .... . . Camel. 
In addition, special dissections have been made on nine human 
subjects, to note the variations of the nerve supply to the sterno- 
mastoid muscle from the cervical nerves. 
Or 
Results. 
. In ungulates generally the nerve-supply of the sterno-cephalicus 
arises from the spinal accessory (motor) and second cervical nerves 
(sensory). The nerve-supply of the brachio-cephalicus originates 
from the spinal accessory (motor) and the 8rd, 4th and 5th cervical 
nerves (sensory). 
The nerve-supply from the cervical nerves to the human sterno- 
mastoid may originate from the 2nd or 3rd cervical nerve or from 
a loop between the two. 
. In the peccary the brachio-cephalicus obtains its cervical nerve- 
supply from the 2nd and 8rd nerves. 
. In the group of mammals comprising the camels, llamas and 
giraffes, the nerve-supply to the sterno- and brachio-cephalie 
muscles comes entirely from the cervical nerves. In these animals 
the spinal accessory consists only of a medullary part whose 
function is to supply the viscera with efferent fibres. There is 
no branch of the spinal accessory to the muscles of the neck. 
. Experimental forcible abduction of the fore limb in ungulates 
produces a lesion of the cervical nerves but not of the spinal 
accessory. 
