LYMPHATIC GLANDS. 



123- 



gathered up by an efferent vessel or vessels (e.l.) which take origin in 

 the lymph-sinuses of the medulla. 



The efferent lymphatics always contain many more lymph-corpuscles 

 than those which enter the gland, for lymph-corpuscles are constantly 

 being formed by indirect division of the pre-existing cells in the 

 glandular substance, and especially in the cortical nodules (Flemming) r 

 and gradually find their way into the lymph-channel. 



FIG. 147.- SECTION OF THE MEDULLARY SUBSTANCE OF A LYMPHATIC GLAND. 

 (300 diameters.) (Recklinghausen.) 



a, a, a, lyrnphoid cords ; c, lymph-sinus ; b, b, trabeculae ; d, d, capillary blood-vessels. 



An artery passes into each gland at the hilum ; its branches are- 

 conveyed at first along the fibrous cords, but soon pass into the 

 lymphoid tissue, where they break up into capillaries (fig. 147, d). 

 The blood is returned by small veins, which are conducted along the 

 fibrous trabeculse to the hilum again. 



In some lymphatic glands the fibrous trabeculae are very slightly 

 developed. 



The tonsils are two masses of lymphoid tissue placed one on each side 

 of the isthmus of the fauces, into which they project. They are covered 

 on the free surface with the stratified epithelium of the mucous mem- 

 brane, and this surface is pitted with apertures which lead into recesses- 



