POSTERIOR ASPECT OF NECK. 



canals. From its inner part a small canal (ductus utriculo- 

 saccularis) leads to and joins a similar canal (ductus erido- 

 lymphaticus) coming from the saccule and traversing the 

 aqueductus vestibuli. The saccule is oval and lies antero- 

 inferiorly. A small canal (ductus reuniens) from its lower 

 part joins the cochlear canal (ductus cochlearis) near the end 

 of the latter. The ductus cochlearis is triangular; it is formed 

 by the basilar membrane and another membrane (of Reissner) , 

 which passes from the upper surface of the lamina spiralis to 

 the outer wall of the cochlea, somewhat above the attachment 

 of the basilar membrane. It contains the organ of Corti, 

 which lies on the basilar membrane. [762] 



POSTERIOR ASPECT OF NECK. 



Fascia. The superficial fascia is usually thick and fatty. 

 The deep fascia is attached to the ligamentum nuchse and su- 

 perior curved line of the occipital; it is continuous with the 

 cervical fascia and invests the muscles. [318] 



SUPERFICIAL MUSCLES. 



Trapezius. Origin; inner third of superior curved line of 

 occipital; external occipital protuberance; ligamentum nu- 

 chse; spines of seventh cervical and all the thoracic vertebrae 

 and corresponding supraspinous ligaments (by tendinous 

 fibres from the occipital bone, lower part of the neck, and lower 

 thoracic vertebra?; elsewhere by fleshy fibres). Insertion; 

 outer third of posterior surface of clavicle; inner side of 

 acromion process and whole upper border of spine of scapula; 

 tubercle at base of spine of scapula, by a flat tendon with a 

 bursa under it. [318] 



Levator Anguli Scapulae. Origin; posterior tubercles of 

 transverse processes of upper three or four cervical vertebrae. 

 Insertion; upper fourth of vertebral border of scapula, from 

 superior angle to spine. [319] 



[103] 



