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Immune system and lymphatic organs (organa Iymphopoetica) 155

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8.8 Lymph node (sheep). The cortex is
heavily populated with lymphocytes. It con-
tains primary and secondary follicles. The
lighter medulla consists largely of a loose
arrangement of reticular and lymphoid
tissue. Lymph passes from afferent vessels
into the node via the subcapsular sinus and
leaves through efferent vessels at the hilus.
Haematoxylin and eosin stain (x15).

8.9 Lymph node (pig). In this species,
afferent lymph vessels enter the node at
the hilus and leave via the subcapsular
sinus. Therefore, lymph follicles aggre-
gate in the inner zone of the node, with
only a few present in the outer cortical
zone. Haematoxylin and eosin stain (x20).

8.10 Detailed view of a section of the
cortex of the lymph node (dog). Reticular
cell processes, macrophages and lympho-
cytes are present within the subcapsular
sinus, which continues into the interme-
diate sinus. Haematoxylin and eosin stain
(x720).

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