THE HEAD AND NECK. 



47 



vein parallels the posterior border of the sterno-cleido-mastoid muscle. It opens 

 into the external jugular vein. (3) The external jugular 'vein crosses the sterno- 

 cleido-mastoid muscle. It is formed, as you must show, by the confluence of 

 (i) the temporo-maxillary, (2) the posterior auricular and facial communicating 

 branch. 



THE DEEP CERVICAL FASCIA. 



I desire the student to have a conception of the deep fascia of the neck, in 

 advance of his work. The following scheme will greatly assist him both in 

 review and during the dissection. 



i . The deep fascia ensheathes the contents of the neck in four strata. The 



Horizontal ramus of 

 lymphatic T 



Vertical ramus of 

 lymphatic T 



, 



FIG. 23. SUPERFICIAL LYMPHATICS. 



student is expected to learn just what structures are ensheathed by each layer 

 of fascia. 



2. The deep fascia has superior attachments, relations, and specializations ; 

 it also has inferior attachments and continuations, thoracic and maxillary, which 

 the student must learn if he ever expects to dissect the neck and thorax under- 

 standingly. 



3. The deep fascia forms septa and sheaths, the rationale of which must be 

 read and studied in the introductory chapter of this book. The deep fascia 

 here, as in every region of the body, belongs to the dense compact variety of 

 connective tissue. 



