546 



PRINCIPLES OF VETERINARY SURGERY 



dermis, depress the subcutem, and crush the glands and 

 neighboring foUicles. 



The melanotic infiltration extends to the subcutaneous 

 connective tissue, and forms masses, more or less regul- 

 larly hemispheric or ovoid, with clear, firm outlines, un- 

 yielding to the touch and very dense (Fig. 67). At the 

 commencement of the disease they usually occur in the 



-J '1. -4 ■' 

 Fig. 66.. 

 Melanosis of the Brain. 



Body of the Sphenoid Cut through the Sella Tursica. 



Zygomatic Process of the Temporal. 



Left Gasserian Ganglion. 



Right Gasserian Ganglion Invaded with Melanosis. 



Section of the Aqueduct of Sylvius and Cerebral Peduncles. 



Section of Left Hippocampus. 



Section of the Right Hippocampus Pressed Back by the Tumor. 



Sphenoidal Lobe Pressed Back. 



Melanotic Tumor (Intracranial Portion) . 



10. Melanotic Tumor (Extracranial Portion) . 



11. Pia Mater Infiltrated with Pigment. 



12. Internal Ear Infiltrated with Pigment. 



form of little grains projecting from the inferior surface of 

 the tail, around the anus, vulva, udder, or prepuce. The tail 

 and perineum is the specially selected place, but they may 

 be found in the subcutaneous tissue of any part of the body. 

 In the stifle, on the elbow, the shoulder, the coronet, in the 

 tracheal region, on the parotids, between the jaws, etc. 



The masses are varied in form and size. At first they 

 are Httle granular nodes in the skin, perceptible to the 



