XI.] 



TENDON. 



18. Perioesophageal Membrane of Frog. To Rnnvier 1 we owe our know- 

 ledge of the value of this membrane. The oesophagus is surrounded by a lymph- 

 sac, which is separated from the pleuro-peritoneal cavity by an excessively thin 

 membrane. The sac is readily distended by insufflation, after pulling out the 

 oesophagus through the mouth by means of a hook. This membrane is covered 

 011 both surfaces by epithelium which can be stained with silver nitrate ; its 

 texture consists of fine connective-tissue with elastic fibres, but containing 

 clasmatocytes, and in it are also to be found blood-vessels and non-medullated 

 nerves. Treat it as described in 16, to see the clasmatocytes. By the same pro- 

 cess the non-mt'dullated. nerve fibres and elastic fibres will also be stained. 



LESSON XI. 

 TENDON. 



Tendon is composed of white fibres arranged longitudinally and 

 parallel to each other. The fibres are arranged in bundles, the 

 tendon-bundles, which are held together by a slieath and sepia of 

 connective-tissue. The fibres are united to 

 each other by a cement substance, and on 

 the- primary bundles of the fibres are placed 

 the tendon-cells, which vary in their shape 

 and arrangement in different tendons. It 

 is supplied by few blood-vessels, and con- 

 tains only a few elastic fibres. 



Tendon. Harden a small tendon of a 

 man, calf, dog, or cat, in Miiller's fluid, 

 alcohol, bichromate of potash, and com- 

 plete the hardening in alcohol. By freez- 

 ing, make transverse and longitudinal sec- 

 tions, or use the celloidin method. Tendons 

 cannot be cut after being embedded in 

 paraffin, they become too hard. 



1. T.'S. Tendon (L). (a.) Stain a sec- 

 tion in picro-carmine, and mount it in 

 Warrant's solution. Observe the sheath 

 (fig. 129, #), composed of connective tissue 

 arranged circularly, sending septa (/) into 

 the substance, of the tendon, thus breaking it up into polygonal 

 areas of different sizes, which are filled by the cut ends of the 

 longitudinally-arranged iibn-s. 



1 CoMjiffs lli-mtiis, vol. Ill, p. 863, 1890. 



FIG. 



129. T.S. Tendon. s. 

 Slieath, with b. Blood-ves- 

 sel ; t. Trabeculsc or septa ; 

 c. l.ranchfd spaces in the 

 tendon for tendon-cells; 

 I. Matrix or cut ends of 

 the fibres, x 50. 



