2l8 



ELEMENTS OF HISTOLOGY. [Chap.xxvm. 



of hyaline cartilage, and in possessing, in the posterior 

 or membranous portion, circular bundles of non- 



-I 



Fig. 127. Prom a Longitudinal Section through the Trachea of a Child. 



a, The stratified columnar ciliated epithelium of the internal free surface; 6. 

 the basement membrane; c, the mucnsa; d, the networks of longitudinal 

 elastic fibres; the oval nuclei between them indicate connective tissue 

 corpuscles; e, the submucous tissue containing mucous glands;/, large 

 blood-vessels; g, fat cells; ft, hyaline cartilage of the tracheal rings. 

 (Atlas.) 



striped muscular tissue, extending, as it were, between 

 the ends of the rings. Its component parts are (Fig. 

 127) : 



(a) A stratified columnar ciliated epithelium. 



(b) A basement membrane. 



