

FIBEO-CARTILAGE. 107 



cartilages present differences in respect to this point, so do we 

 find some giving more some less chondrin on boiling. The 

 fibrous material does not itself undergo solution on boiling. A 

 beautiful object for the observation of the above-mentioned tran- 

 sition of the elastic fibres of cartilage into those of the skin, is 

 afforded by sections made through the auricle of man, first 

 boiled for a short time as a whole, and then dried (see fig. 8). 



Moreover the fibres of the fibro-cartilaginous extremity of 

 the processus vocalesof the arytenoid cartilages pass immediately 

 into the elastic fibres of the vocal cords.* This latter fact is 

 opposed to the view maintained by Gerlach,~f* of the specific 

 distinctness of the fibres of plexiform cartilage. The parts com- 

 posed of elastic fibrous or retiform cartilage consist in man 

 of the auricle of the ear, of the epiglottis, and the extremity of 

 the processus vocales of the arytenoid cartilages (Rheiiier). 



CARTILAGE MINGLED WITH CONNECTIVE TISSUE. Cartila- 

 ginous tissue occurs, and frequently in very considerable 

 masses, imbedded in connective tissue. Efforts have in con- 

 sequence been made to establish a special group of fibro- 

 cartilages, the connective-tissue cartilages; but it would appear 

 to be more correct to describe these structures as mixtures of 

 the two tissues. Such mixtures occur in the interarticular 

 cartilages, the glenoid cartilages, the cartilages of the sym- 

 physes, at the articular extremities of the clavicle, and the 

 corresponding articular surfaces of the scapula and sternum 

 (Henle), and in the tarsal cartilages of the eyelids. With 

 these must also be enumerated the tendons and tendinous 

 sheaths containing cartilage. Such tendon-cartilage may be 

 frequently observed in the tendons near their attachments to 

 bone. The Tendo Achillis of the Frog must especially be 

 mentioned as presenting large cells with round nuclei, which 

 may be regarded as cartilage cells, and which are present in 

 considerable numbers.J 



* Rheiner, Beitrdge zur Histologie des Kehlkopfes. Wurzburg, 1852. 

 t Gewebelehre, p. 124. 



J Kolliker, Lehmann, Zeitschrift filr wissenschaftliche Zoologie, Bandxiv., 

 p. 109, Taf. 14. 



L 



