TUMORS. 481 



connective-tissue sheath of the nerve. Myxomatous tumors are 

 sometimes found in the parotid gland, in the female breast, in the 

 ovaries and the testes. In the last-named positions they may be 

 combined with glandular and secondary cystic formations. Vir- 

 chow observed myxoma in the medullary space of shaft-bones. 

 I have seen an intr a -ocular myxoma completely filling the slightly 

 enlarged eyeball. 



fbj Myxoma of the Structure of the Umbilical Cord. This is 

 composed of comparatively thick bioplasson strings which, hold- 

 ing a varying number of nuclei, are united in a reticulum. The 

 meshes contain the jelly-like basis-substance, and in this are im- 

 bedded apparently isolated plastids, such as are found in the 

 tissue of the umbilical cord. The homogeneous basis-substance 

 is sometimes mixed with fibrous connective tissue, either in single 



FIG. 182. MYXOMA OF THE PAROTID GLAND. 



C, bioplasson-cords, with numerous nuclei, branching and uniting ; B, jelly-like basis- 

 substance, which holds single mostly central plastids, I. Magnified 600 diameters. 



fibrillae or in delicate bundles. Gold staining brings to view the 

 retieular bioplasson structure within both varieties of basis-sub- 

 stance, as it does in the tissue of the umbilical cord. (See Fig. 

 182.) 



The myxoma of umbilical cord-structure is rarer than the 

 31 



