76 The Normal Histology of the Human Hemolymph Glands 



along the vertebrae behind the aorta or between it and the vena cava. 

 These glands are flattened and long in proportion to their breadth, 

 their greatest dimension lying parallel to the axis of the neighboring 

 vessel. They may have a distinct hilum, bnt the number of vessels 

 entering is not so great as in the case of the splenolymph glands. 

 Lymph vessels may also be found in connection with these glands. 

 The latter vary greatly in size, but are sometimes found as slender 

 cylinders several centimeters long embedded in adipose tissue. They 

 are white or pinkish in color with fine red lines corresponding to the 

 blood-sinuses. Their consistence is very soft and on section they pre- 

 sent an almost homogeneous surface. 



They possess a thin capsule which contains but little luistriped 

 muscle and yellow elastic tissue. Delicate trabeculge run from this 

 toward the centre of the gland. Beneath the capsule there is a blood- 

 sinus of small size which usually runs entirely around the periphery 

 and from this there are narrow branching sinuses accompanying the 

 trabeculge toward the centre of the gland. All of the sinuses are filled 

 with a coarse reticulum through the meshes of which the blood circu- 

 lates. Dilated sinuses like those of the splenolymph glands are not 

 present. The course of the sinuses is shown by the lighter staining 

 nuclei of the reticulum and by the presence of red-cells. Lymph sinuses 

 are also present in some of these glands. Between the sinuses lies the 

 lymphoid tissue arranged in irregular islands or lobules and is in much 

 greater amount than in the splenolymph glands. Collections of cells 

 resembling follicles are not found in the pure type of this gland. 

 Throughout their central portions large numbers of fat cells are usually 

 present. 



The reticulum of the lymphoid tissue is more delicate and contains 

 but little elastic tissue. The lymphoid areas are richer in cells and 

 these present a much greater variety than in the splenolymph glands. 

 Mononuclear eosinophiles and mast-cells are more numerous, and multi- 

 nuclear as well as large mononuclear forms with deeply-stained knobbed 

 nuclei also occur. Giant-cells resembling those of the bone-marrow are 

 also occasionally found, and in certain pathological states of the blood 

 may be very numerous. No nucleated red cells have been found in 

 normal conditions. The lymphocytes and large mononuclears show 

 a much greater diversity of form and staining power, and there is also 

 a great variety of cells in the reticulum of the sinuses. Phagocytes 

 containing red-cells pigment, fuchsinophile hyaline bodies and leuko- 

 cytes occur to a much less extent than in the splenolymph glands. Eed- 



