r8 4 



HEAD AND NECK 



It is essential that the division of the anterior part of the mandible 

 should be slightly lateral to the median plane on each side, in 

 order that the median part of the bone, with the attachments of 

 the genioid muscles, may be left intact. 



After the division of the bone has been completed the lower 

 border of the lateral part of the mandible must be everted, 



M. semispinalis ca 

 Posterior auricular 



ununication frcm posterior facial vein 

 Int. jugular vein 

 Hypoglossal nerve 

 Posterior facial 

 Lesser occipital N. 

 Hypoglossal nerve 

 Great auricular N. 



Suprascapul 



FIG. 67. The Triangles of the Neck seen from the side. The clavicular head 

 of the sterno-mastoid muscle was small, arid therefore a considerable part 

 of the scalenus anterior muscle is seen. 



turned slightly upwards, and fixed in position with hooks. When 

 that has been done the boundaries and contents of the sub- 

 maxillary region can be examined. 



Part of the region has already been seen as the digastric 

 portion of the anterior triangle of the neck, but it will now be 

 obvious that the region occupied by the submaxillary gland is 

 much more extensive than the digastric triangle ; for, although 



