140 MANUAL OF HISTOLOGY. 



The muscular fibre of the heart. This is transitional in 

 structure between the voluntary and the involuntary. The 

 fibres of the heart of the frog resemble chiefly the latter, being 

 made of elongated, narrow, nucleated cells, which differ from 

 it only in being transversely striped. In the mammalia the 

 fibres are broader and composed of nucleated cells placed end 

 to end. These cells frequently give off lateral processes which 

 support others, thus forming a network of fibres. The cells 

 have both a longitudinal and a transverse series of stripes, 

 but the latter are not so clear as in well-marked voluntary 

 muscle. 



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BOWMAN. On the Structure and Movements of Voluntary Muscle. Philosoph. 



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AMICI. Ueber die Muskelfaser. Virchow's Archiv. Bd. XVI. 1859. 

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schrift fiir ration. Medicin. 3te Reihe. Bd. XII. 1861. 

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Archiv. Bd. XXXIV. 1865. 



DWIGHT. The Structure and Action of Striated Muscular Fibre. Proceedings Bos- 

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Archiv fiir mikroscop. Anat. Bd. V. 1869. 

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SCHWEIGEB-SEIDEL. The Heart. Strieker's Histology. 1872. 

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1872. 

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Strieker's Histology. 1872. 

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IX. 1873. 



