116 



MUSCULAR TISSUE 



FIG. 130. PORTION OF A TRANSECTION OF A LARGE 



TENDON. 



a, fibrous capsule with circular, and at 6, longitudinal 

 bundles of connective tissue; c, d, and e, fibrous septa be- 

 tween the fasciculi of the tendon; I, lymphatic cleft. 

 Moderately magnified. (After Schafer.) 



perimysium. In the 

 mouse, tendons con- 

 sist of from 1 to 11 

 fasciculi ; in the 

 chick from 2 to 5 

 (Loevy, Anat. Anz., 

 45, 10-11, 1913). 

 Each fasciculus con- 

 sists of elementary 

 bundles of collage- 

 nous fibrils, envel- 

 oped by a complete 

 sheath formed by 

 the anastomosing 

 processes of the ten- 

 don cells (cells of 

 Eanvier). The cell 

 bodies lie between 

 these primary bun- 

 dles; they are connected to each other by their processes, forming an 

 'endotheliaF tube (Eanvier), the cells of which have a characteristic 

 mesothelial appearance in sil- 

 ver nitrate preparations. 



In the tendons of the tail 

 of the mouse, Loevy describes 

 the cells as flat, rectangular, 

 and rhomboidal; they are 

 parallel to the long axis of 

 the tendon, two of their sur- 

 faces extended into flat plates 

 or wings which effect a union 

 with ' wings' of adjacent cells. 

 A cell may have from 2 to 4 

 wings. The wings or plates 

 have been interpreted as elas- 

 tic in nature, but do not re- FIG. 131. TRANSVERSE SECTION OF TENDON 

 act to specific stains for elas- OF TAIL OF ADULT MousE ' 



tic tissue. Each cell contains Jt consists of four secondary bundles or fas- 



a snhprirfll or rwal <Wnlv ciculi > s ' b ''> p - b '> P rimar y bundle; p., epiten- 

 oval deeply dineum . cR tendon cell (cell of Ranv i er ). 



staining nucleus; the nuclei (After Loevy, Anat. Anz., 45, 10, 1913.) 



c.R. 



