80 



Framework of Clandula Paratliyroidca 



of anastomosing and branching fibrils. Wlien thick, stained, digested 

 sections from 50 microns up are stndied, these broken septa are obvionsly 

 continuous in the third dimension with other processes that turn off and 

 occupy various planes according to the branching of the anastomosing 

 cell columns. In this way in these preparations, especially under the 

 low power, it often appears as though the framework formed a continuum 

 stretching across tlie gland. In considering the structure and arrange- 

 ment of the framework in three dimensions, this is, of course, true, the 

 broken irregular septa appearing only in thin sections where the con- 



FiG. 3.— Section of parathyroid of dog-. Stained by Mallory's method. X 63. c = Cap- 

 sules. s=Finer septa. a=CeIl columns. by=Hlood-vessel. 



tinuity of the third dimension is broken. Under ordinary circumstances 

 the septa are comparatively fine and delicate. Eelatively speaking, how- 

 ever, the framework is not abundant. Occasionally large septa project 

 inwards from the capsule, either in connection with or independent of 

 the blood vessels. The majority of the large vascular trunks, however, 

 £iS is seen in piece digestions also, are found in the center of the organ. 

 Aroimd the adventitia, the framework is abundant and in these situations 

 large fasciculi of considerable dimensions are often found. When thin 

 sections are studied under the immersion lens, the framework can readily 

 be resolved into the ultimate constituent fibrils of which it is composed. 

 These fibrils branch and anastomose, and are of extreme delicacy. In 



