TENDON. ELASTIC TISSUE. 35 



plasm often exhibits a ridge-like marking at the thickest part, 

 which extends along the row, this is due to the moulding of 

 the cells by neighbouring bundles, and is known as Boll's 

 stripe. 



Tendon of a large mammal. T.S. (p. formol 4 1XC - and acetic 

 acid l pc> , each 1 week, c. G., s. 19, m. F.) The tendon cells 

 are much less numerous proportionately, than in the rat's tail, 

 .and are not so regular in their arrangement. Their number 

 is largely a question of age. In young tendons they are much 

 more numerous. Fine elastic fibres are present, and are to be 

 recognised as small dots in the white fibrous substance. 



Yellow fibrous or elastic tissue. Ligamentum Nuchce, 

 Ox., (p. 2 (d), s. 19, m. F.). 



Tease some of this tissue digested in acetic acid, it is more readily 

 dissociated than the fresh tissue, as the white fibrous tissue has been 

 softened by the acid. 



(ff) The fibres branch and form a network of elongated 

 mesh, the coarser fibres occasionally exhibiting transverse 

 linear perforations. On the concavities of bent fibres slight 

 transverse corrugations may be perceived, these are indicative 

 of a surface membrane. No nuclei are visible in or imme- 

 diately connected with the fibres. 



Ligamentum Nuchce (p. 2 (d), c. G., s. 19, m. F.). L.S. The Elastic 

 tissue fibres, stained yellow by the picric acid, are surrounded 

 by white fibrous tissue stained pink, in the latter nuclei are 

 recognisable, but none . in the yellow tissue. Observe the 

 branching of the fibres. 



T.S. (ff) Note the yellow fibres cut across, forming irregular 

 clusters, embedded in the pink white fibrous tissue as before. 

 In the large arteries elastic tissue occurs, resembling the 

 above, but of finer texture. See later. 



