810 DIRECTIONS FOB LABORATORY WORK 



from the zonae glomerulosa, fasciculata and reticularis. Enumerate the 

 chief differences in gross arrangement of the cells and in their cyto- 

 plasmic contents. Sketch also (360) a group of cells from the medulla. 

 What is the chief granular content of these cells ? Significance? Sketch 

 also (361) a segment of the central vein. What is remarkable about this 

 vessel ? 



(3) Study a stained horizontal section through the zona glomerulosa. 

 Arrangement of the glomerular cells? Function of the adrenal? Rep- 

 tilian and ichthyoid homologues? 



(4) Study an injected specimen of cat's adrenal. Diagram the ar- 

 terial blood system (362). Relation of the cells to the venous capil- 

 laries ? Significance of the separate blood supply of the cortex and the 

 medulla ? 



(B) THE THYROID GLAND. 



Study l.p. a stained section of the human thyroid gland. Note : cap- 

 sule, lobules, follicles and colloid content of latter. Sketch (363) a 

 small area including the capsule and the interfollicular stroma. Sketch 

 h.p. (364) a folicle, noting especially the two types of lining cells: a, 

 chief cells; b, colloid cells. What are the striking characteristics of the 

 colloid content of the follicle ? Cellular inclusions in the colloid ? 



From an injected specimen of the cat's thyroid diagram the blood 

 supply of a lobule (365). 



What morbid condition is associated with atrophy of the thyroid? 

 with hypertrophy ( hyper seer etion )? with arrested development? Nor- 

 mal function? 



How does aberrant or accessory thyroid tissue differ from that of 

 the thyroid proper? 



What are the salient differential characteristics of sections of the 

 thyroid, active mammary gland and prostate gland? 



(C) THE PARATHYROID GLANDS. 



Make h.p. sketch (366) of a small area of a stained section of a 

 parathyroid (epithelial body). Note the 'acidophiF and 'principal' types 

 of cells. Does colloid material occur? Spatial and functional relation- 

 ship between thyroid and parathyroids. Function of the parathyroids? 



(D) THE THYMU8 GLAND. 



Study l.p. a stained section of the human thymus. Note: capsule, 

 lobules (with cortex and medulla) and interlobular connective tissue 



