244 ANATOMY AND PHYSIOLOGY FOR NURSES 



THE THYROID GLAND 



This is a small, flat, glandular body lying against the 

 anterior surface of the trachea, below the thyroid cartilage. 

 It is susceptible of great enlargement, and is often found 

 abnormally enlarged, especially in women. This enlarge- 

 ment constitutes the disease called goiter, bronchocele, 

 and sometimes "big neck." 



Foramen cecum. 



Lingual duct. 

 Epiglottis. 



Thyroid gland. 



Trachea. 



FIG. 126. The thyroglossal duct (Marshall). 



The thyroid gland, although supplied with four large 

 arteries and veins and also with four nerves, has no excre- 

 tory duct that has yet been discovered. Its function has 

 never been thoroughly understood. 



THE LACRIMAL GLANDS 



These two small glands, which are situated, one upon 

 each side, in a depression in the frontal bone at the upper 

 and outer angle of the orbit. (See Fig. 127.) 



