Charles R. Bardeen 371 
to tendon along lines parallel with the muscle fibres is approximately the 
same in all parts. There are, however, numerous exceptions, the most 
marked of which are found in larger sheet-like muscles such as the oblique 
and transverse muscles of the abdomen. Frequently in case of exceptions 
of this nature, as for instance in case of the abdominal muscles, the adult 
h ] 
Fig. 7. Diagrams to illustrate nerve-muscle development. a. Embryonic 
muscle anlage. 6. Anastomosing bundles of muscle fibers. c. Band-like muscle 
developed transverse to course of main nerve trunk. d. Triangular muscle 
developed transverse to course of main nerve trunk. e. Pennate muscle devel- 
oped parallel with course of main nerve trunk. ff. Bipennate muscle devel- 
oped parallel with course of main nerve trunk. g. Fusiform muscle. h. Band- 
like muscle developed parallel with course of main nerve trunk. 7, Triangular 
muscle developed in direction with course of main nerve trunk. 
human muscle represents a combination of several simpler muscles in 
each of which the general rule holds good in the embryo or in some of 
the lower mammals. For the architecture of the abdominal muscles in 
the mammals, see Bardeen, 03. 
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