[THOMPSON] CERVICAL REGION OF THE FROG 71 
Fig. 4.—Section through a small part of the parathyroid of a frog under a high 
power. Some of the cells are clear while others are granular. 
Fig. 5.—Section through a small part of the ventral branchial body of a frog 
showing the features above referred to (Fig. 3) in greater detail. 
Fig. 6.—Section through the post branchial body of the frog showing cavities 
lined with epithelium, which is arranged for the most part in two layers of cells. 
Low power drawing. 
Fig. 7.—Section through a small portion of the post branchial body of the frog 
showing features above referred to in greater detail. 
Fig. 8.—Section through the carotid body of the frog near the bifurcation of the 
carotid artery. The “cavernous” structures are shown. Low power drawing. 
Fig. 9.—Section through the propericardial body, showing its general structure, 
and a portion of the surrounding fat. 
