10 



DISSECTION OF THE BACK. 



Nerve of 

 rhomboid 

 muscles. 



Serratus 

 inagnus 

 muscle. 



NERVE TO THE RHOMBOID MUSCLES. This slender offset of the 

 brachial plexus (fig. 8, p. 26) courses beneath the elevator of the 

 angle of the scapula, and is distributed to the rhomboidei on their 

 deep surface. Before its termination it supplies one or two twigs 

 to the elevator of the scapula. 



Dissection. The levator anguli scapulae and the rhomboid 

 muscles are now to be divided about half-way between their 

 origin and insertion, and the parts turned inwards and outwards. 

 The small nerve to the rhomboids will be found running down to 

 the deep surface of the muscles about an inch to the inner side of 

 the upper angle of the scapula, and the posterior scapular artery 

 running close to the vertebral border of the scapula beneath the 

 rhomboid attachment will be traced out. Finally, the vertebral 

 border of the scapula will be drawn outwards, the loose connective 

 tissue space between it and the chest-wall will be opened up, and 

 the inner surface of the serratus magnus muscle, which is inserted 

 into the whole length of the inner surface of this border of the 

 bone, will be cleaned. 



