78 



HUMAN ANATOMY. 



of the fibrous tissue, held together by cement-substance, are associated as compara- 

 tively large primary bundles, which in turn are united by interfascicular fibrous 



Fig. 105. 



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II 





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Fig. 106. 



Tendon-bundle 



Profile view 



Oblique view 



Surface view 



Longitudinal section of tendon from young subject; Tendon-bundles from tail of mouse, showing different 

 the tendon-cells are seen in profile between the bundles views of the cells. X 300. 



of fibrous tissue. X 300. 



Blood-vessel within septa 

 enclosing tertiary bui 



substance and grouped into seco7idary biaidles. The former, invested by a delicate 

 areolar sheath and partially covered by plate-like cells, are held together by the 



septal extensions of the 

 Fig. 107. general connective-tissue 



envelope which surrounds 

 the entire tendon ; the 

 larger septa support the 

 interfascicular blood-ves- 

 sels and the lymphatics. 



The flattened connec- 

 tive-tissue elements, here 

 known as the tendon-cells, 

 occur in rows within the 

 clefts between the primary 

 bundles, upon and between 

 which the thin, plate-like 

 bodies and wings of the 

 tendon-cells expand. Seen 

 from the surface, these 

 cells appear as nucleated 

 quadrate bodies (Fig. 

 106) ; viewed in longitudi- 

 nal profile, the tendon-cells 

 present narrow rectangular 

 areas, while, when seen in 

 transverse section, the 

 same elements appear as 

 stellate bodies, the extended limbs of which, often stretching in several planes, 

 represent sections of the wing-plates. 



Examined in cross-section (Fig. 107), the cut ends of the primary tendon-bun- 

 dles appear as light irregular polygonal areas, which, under high amplification, at 



Secondary 

 bundle 



Primary 

 bundle 



Transverse section of a tendon, showing grouping of primary, secondary, 

 and tertiary bundles of tendon-tissue. X 85. 



