762 



DISEASES OF THE WITHEES. 



This band is specially liable to attacks of necrosis. 4tli. The su- 

 perior portion of the anterior small serratus muscle, which is 

 formed by a broad aponeurosis, attached to the superior extrem- 

 ity of the spinous processes of the vertebrae (Fig. 559). 5th. The 



Fis. 560.— 5th Layer of tlie Withers, 

 pi. — Lamellar portion of the cervical ligament, pf. — Funicular portion of the same, 

 ao.— Superior cervical artery, te. — Transversal spinous of the neck. bs. — Superior 

 branch of the spinalis, hi. — Inferior branch of the same muscle, ic— Common inter- 

 costal, ad.— Dorsal artery, gd.— Great serratus. si.— Inferior scalenus, it.— Inter- 

 transversalis muscle. 



anterior portion of the ilio-spinalis muscle (Fig. 560). The 6th 

 and the deepest of these planes, resting on the faces of the long 

 spinous processes of the vertebrae, is formed by the transverse 

 spinal muscle of the back. (Fig. 561). To these are to be added 

 the posterior extremities of some of the muscles of the neck, 

 covered by the internal face of the scapula, the ramification of 

 the large blood vessels, branches of the anterior aorta, and the 

 dorsal and superior cervical artery with the spiaal nerves which 

 are distributed in that portion of the body. If we map aU this 

 distinctly ia our miuds, we shall have the material for forming an 

 idea of the structure of the withers, and the intricate and inter- 

 esting arrangement and disposition of its many parts, with their 

 relation to the ailments which attack them. This wOl be facilitated 

 by an inspection of the Ulustration (Fig. 562), representing a 

 transverse section of the entire region involved. The drawing 

 exhibits the obliquity of the direction of the various muscular 

 layers, and demonstrates the tendency of the purulent gatherings, 

 by gravitating and collecting between them, to contribute to the 



