The Nervous System 139 



and sends a small branch to the levator scapulas 

 superficialis muscle. 



V. The ventral branch of this nerve sends 

 branches to the ventral muscles of the neck, to the 

 levator scapulae superficialis; a large branch goes 

 to the sterno-mastoid ; and the rest of the nerve 

 distributes itself in the sphincter colli and the 

 integument and ventral muscles of the neck. 



VI. The sixth nerve distributes itself to the 

 ventral musculature and to the integuiment of 

 the neck, and sends a fairly strong branch to the 

 levator scapulae superficialis muscle and to the 

 most anterior part of the coUo-thoraci-supra- 

 scapularis profundus muscle. 



VII. The seventh nerve is the first to enter, 

 by a small branch, into the brachial plexus (Figure 

 31). It also sends a branch to the ventral muscles 

 and the integument of the neck, and three branches 

 to various shoulder muscles. 



VIII. The ventral branch of the eighth nerve 

 (Figure 31) is the second largest nerve of the 

 brachial plexus. It gives some twigs to the ven- 

 tral muscles and then gives one or two nerves to 

 the collo-thoraci-suprascapularis profundus and the 

 serratus superficialis muscles. The rest of the 

 nerve divides into an inferior and a superior branch 

 which unite with the ninth nerve. 



IX. The ninth and tenth nerves are the largest 

 of the brachial plexus. The former, after giving 

 off some twigs to the ventral musculature and to 



