i6o 



HEAD AND NECK 



Posteriorly, in the majority of cases, the apex of the pleura 

 corresponds, in level, with the neck of the first rib. It forms 

 a dome-like roof for each side of the thoracic cavity, and is 

 strengthened by a fascial expansion (frequently termed Sibson's 

 fascia), which covers it completely, and is attached, on the 

 one hand, to the transverse process of the seventh cervical 





Parotid duct 



Accessory parotid gland 



/ M. pterygoideus internus 



/, / 



Mandible 



ubmaxillary duct' 

 Mucous membrane 



Sublingual gland 



Tongue 



M. mylohyoideus 

 M. digastricus (anterior belly) 



Lingu 1 nerv 

 Mandible 



-M. mylohyoideus 

 Surface of submaxi 

 ^~~lary gland covered 



by mandible 

 Surface covered by 

 integument and fasciae 



FIG. 58. Dissection of the Parotid, Submaxillary, and Sublingual Glands. 



vertebra, and, on the other, to the inner margin of the 

 first rib. 



Note that it is in relation with : (i) the scalenus anterior; 

 (2) the scalenus medius ; (3) the subclavian artery; (4) the 

 vertebral artery ; (5) the costo-cervical trunk ; (6) the superior 

 intercostal artery; (7) the internal mammary artery; (8) the 

 innominate vein ; (9) the vertebral vein ; (10) the subclavian 

 vein; (n) the vagus nerve ; (12) the phrenic nerve ; (13) the 

 recurrent nerve, on the right side; (14) the first thoracic 



