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In adaptive immunity, lymphocytes are the main players and differentiate into two main types: T cells and B cells. T cells mature under the influence of the thymus, which is why they’re tied to thymic hormones and development. These cells drive cell-mediated immunity, directly attacking infected cells and coordinating other immune responses through signaling molecules. That makes them essential for responses that don’t rely on antibodies.

B cells, by contrast, mature in the bone marrow and primarily produce antibodies as part of humoral immunity. Neurons and the digestive system are not lymphocytes and don’t fit the description.

Therefore, the term that denotes this thymus-influenced, cell-mediated lymphocyte is T lymphocyte.