The Histogenesis of Smooth Muscle in the Alimentary Canal etc. 245 



Fig. 28. From the mnscularis mucosae of the adult lower oesophagus; the muscle 

 cells are cut in cross section. Compare with Fig. 26. The longitudinal 

 elastic fibers show cut in cross section. Here their resemblance to „Grenz- 

 fibrillen" is apparent. The circular elastic fibers are cut longitudinally 

 and show the branching and anastomosing. Zenker's fluid. Weigert's 

 elastic tissue stain, x 1425. 



Fig 29. From the circular muscle layer of the adult lower oesophagus, the muscle 

 cells cut in cross section. Muscle cells contain an exceptionally large 

 number of coarse myofibrillae {fc). The coarse myofibrillae are not so 

 regular in outline in the original drawing as is shown in the reproduction. 

 Between the coarse fibrillae are numerous fine myofibrillae, here also 

 staining black {ff). The interstitial connective tissue is in a dense reti- 

 culum, and contains numerous elastic fibers {el). Gilson's fluid. Iron- 

 haematoxylin and eosin. x 1425. 



