THYROID GLAND. 



363 



on account of its numerous peculiar large cells, and great rich- 

 ness in nerves, has been explained as belonging to the nervous 

 system. 



THYROID BODY. 



The thyroid is made up of groups of minute closed sacs im- 

 bedded in a stroma of connective tissue, lined with a single row 



FIG. 158. 



FIG. 159. 



FIG. 158. Portion of Thymus removed from its envelope and unravelled 

 so as to show the lobules (6, 6) attached to a central band of connective 

 tissue (a). 



FIG. 159. Magnified section of a portion of injected Thymus, showing 

 one complete lobule with soft central part (cavity) (6), and parts of other 

 lobules. (Cadiat.) (a) Lymphoid tissue, (c) Bloodvessels, (d) Fibrous 

 tissue. 



of epithelium cells, and filled with a clear fluid containing mucin. 

 In the adult the sacs are commonly much distended with a col- 



