MUSCULAR TISSUES 



27 



enclosed by a loosely attached, viscous, elastic membrane, the sar- 

 colemma, and contains many nuclei. The presence of the latter 

 indicates that the fibre is not a single cell but a syncytium, i.e., an 

 association of cells unseparated by cell boundaries. The muscles 

 formed by such fibres are under the control of the will, their connec- 



FiG. 15. Photomicrograph of a longitudinal section of the pyloric region of 

 a rabbit. X 10. The end of the pyloric antrum appears below, the beginning of 

 the duodenum above, m.m., muscularis mucosae; t.m.c, circular layer of the 

 muscular tunic; t.m.l., longitudinal layer of the muscular tunic; t.ms., mucous 

 tunic; t.s., tela submucosa; t.sr., serous tunic. 



tions being directly with the central nervous system. They com- 

 prise not only the typical muscles of the skeleton, but also the 

 special muscles which serve to connect the skeleton with the 

 skin. 



Two kinds of striated muscle fibres occur, red and pale. Those 



