158 



Fascia of the Neck. 



Cttrkihyreold 



Cms poster. 

 L >'y. interda vie u I 

 Arcus i'gnos. 



212, The Cervical Fascia, Superficial Layer. 



The superficial layer of the cervical fascia (below the Platysma 

 myoides) covers the MM. sterno-cleido-mast., star no-liy old., sterno-tliyreoid., tltyreo- 

 hyoid. and the anterior belly of the Omo-Tiyoid., is continued superiorly into the 

 Fascia parotldeo-masseterica , and is attached above to the lower border of the 

 lower jaw, and below to the Manulirium sterni and Liy. intercJaviculare. The 

 deep layer (Fig 1 . 213) forms the floor of the Trig, inframaxill. and supradavicul. , 

 covers the posterior belly of the Omo-l>yoideus, forms sheaths for the large vessels 

 (the Nerr. vagus has no separate sheath) and divides into two layers. One forms 

 the praevertebral fascia behind the pharynx and oesophagus; the other extends 

 in front of the thyroid gland and the trachea to the median line, and at the root 

 of the neck may be traced over the large vessels, to be continuous with the 

 fibrous layer of the pericardium. 



