Answer
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Lymph Nodes
1- Lymph nodes are multiple & present in groups all
over the body.
2- they filter the lymph.
3- they have many afferent & efferent lymph vessels.
4- covered with fascia.
5- capsule is thin & not adherent.
6- Trabeculae are thin, short & arise from the capsule.
7- Lymphatic nodules are arranged into cortex &
medulla.
8- in the cortex there are the Lymphatic nodule with
clear germinal centres but with no central
arterioles.
9- presence of cortical & medullary lymphatic sinuses.
10- presence of medullary lymphatic cords.
11- Cells: are mainly lymphocytes, plasma cells &
macrophages.
12- Functions : humoral & cell-mediated
immunological response.
Spleen
1- the spleen is a single organ present in the abdomen.
2- it filters the blood.
3- it has few lymph vessels in the capsule &
trabeculae.
4- covered with Peritoneum.
5- Capsule is partially thick, adherent & rich in smooth
muscles.
6- Trabeculae are thick, long & arise from the hilum
& capsule.
7- Lymphatic tissues are the white & the red pulps
( not arranged in cortex & medulla ).
8- the white pulp are scattered in the spleen
containing central arterioles but their germinal centres
are not clear.
9- presence of Billorth cords or red pulps.
10- Cells : are mainly RBCs, Leucocytes, plasma cells
& macrophages.
11- Function : mainly humoral immunological
response.