Lymphocytes occupy specific regions within the lymph node and it can be quite tiring at times to remember which one lies where. A small mnemonic can be used in order to keep the information tidy in your brain castle.

Figure : Diagram of lymph node showing locations of B cells and T cells within follicles and paracortex, respectively

The mnemonic goes : Boy Friend (needs) Toilet Paper

B cells reside in Follicles of the lymph nodes which are also known as primary follicles. They form the definitive Cortex of the lymph node. They also occupy the Medulla (the center most part) of the lymph node.

The area in between cortex and paracortex is the home for T cells of the lymph node, called Paracortex.