TUMOES 97 



eye, and is also represented by tlie so-called Whartonian 

 jelly of the nmbilical cord. Microscopically, it is composed 

 of stellate connective tissue cells, the branching processes of 

 which form a network in which the gelatinous basis sub- 

 stance is lodged. 



Do all authors looJc upon the myxoma as an independent type 

 of tumor ? 



They do not. Some claim that the myxoma is simply an 

 cedematous fibroma or lipoma ; in other words, a myxofi- 

 broma or myxolipoma. Others state that they are simply 

 connective tissue tumors which have undergone mucoid 

 change. 



How does the myxoma occur f 



Usually solitary and pedunculated. 

 Describe the myxoma. 



It is quite rare ; as a rule, small, soft, elastic, vibratory 

 and pedunculated ; grows slowly. On section, it is yellowish- 

 grey, and a glairy mucin containing fluid exudes. 



How do you differentiate these from soft, fibrous, or fatty 

 twmors, etc. 



By testing contents with hypodermic needle. 

 To what secondary changes are these tumors liable ? 



Inflammation, ulceration, fatty degeneration. 

 What are the causes of myxomata 9 



Not known. 

 Name the seat of predilection of {he myxoma. 



About the same as fibromata, as subcutis, submucosa, etc. ; 

 therefore, in the horse it is most commonly met with in the 

 upper portion of the nasal cavity, here called nasal polypus, 



