14$ 



HEAD AND NECK 



After the contents of the lower part of the triangle are thoroughly cleaned, 

 remove the remains of the fascia covering the muscles which form 

 the floor of the triangle. Note that this fascia is continuous anteriorly, 

 round the tips of the transverse processes of the cervical vertebra with the 

 prevertebral fascia. Posteriorly it blends with the sheaths of the deeper 



Semispinalis cap 

 Posterior auricular v 



Ext. jugular vein 

 Int. carotid artery 

 Hypoglossal nerve 



Posterior facial vei 



Small occipital N. 

 Int. jugular vein 



Great auricular N. 

 Trapezius 



- Digastric 

 Nerve to thyreo-hyoid 

 Thyreo-hyoid 

 Superior thyreoid arterj 

 Omo-hyoid 



Splemus capitis 



Nervus cutaneus colli 



Accessory N. 



Dorsalis scapulre nerve 

 Ext. jugular ve 



Scalenus medius 

 Trans, cervical artery 



Omo-hyoid 

 Brachial plexus 



Transverse 

 f scapular artery 

 Scalenus anterior 

 Subclavian artery 

 Subclavian vein 



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

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

 of the scalenus anterior muscle is seen. 



muscles at the back of the neck ; above it is attached to the superior 

 nuchal line ; and below, as already stated, it is prolonged into the axilla 

 along the axillary vessels and nerves. 



Boundaries and Contents of the Posterior Triangle. The 



dissection of the triangle should be completed in two days. 

 On the third day the dissector should revise his knowledge 

 of the boundaries and the relative positions of the contents. 



