48 THE LARYNX AND TRACHEA, BY E. VERSON. 



part of the rings. At the posterior surface of the trachea they 

 form several layers, one being situated between the mucous 

 and muscular coats, another in the muscular coat itself, and 

 others behind this coat, so that their excretory ducts, which 

 run straight to the surface, perforate the muscular coat. 



The vessels form superficial plexuses in the tracheal mucous 

 membrane, similar to those of the larynx. 



The mode in which the nerves terminate is still unknown. 

 In the posterior fibrous membrane they present ganglionic 

 swellings of considerable size, and of rounded oblong form, the 

 longest diameter of which is parallel to the axis of the nerve. 

 Their breadth amounts to 0'2 of a millimeter, their longitudinal 

 diameter is about from two to three times greater. 



LITERATURE. 



MECKEL, Anatomie, Band vi. 



C. MAYER, in MERKEL'S Archiv, 1826. 



HENLE, Anatomie des Kehlkopfes ; Anat., Band ii. 



KHEINER, Beitrage zur Histologie des Kehlkopfes. Diss. 1852, und 



in Wurzbiirger Verhandlungen, Band iii. 



LUSCHKA, Zeitschrift fur rationelle Medicin., 3 Keihe, Band xi. 

 BEITZ, Kunstliche Erzeugung von crouposer Pneumonie. Akad. der 



Wissenschaft. zu Wien, Band lv., Abtheil ii. 

 VERSON, Beitrage zur Kenntniss des Kehlkopfes und der Trachea. 



Akad. der Wissenschaft. zu Wien, Band Ivii., Abtheil i. 

 LUSCHKA, Die Schleimhaut des Cavum Laryngis. Archiv fur 



mikroskop. Anatomie, Band v., Heft i. 



