However, the structure of lymphatic tissues vary according to the particular type of lymphatic tissue or organ they form a part of - (a), (b) or (c) above, and possibly also it's location in the body-especially in the case of (c) Lymph (Fluid).
The exposition is the portion of a story that introduces important background information to the audience; for example, information about the setting, events occurring before the main plot, characters' back stories, etc.
Elements of a Narrative. A narrative text engages the reader in a storytelling format that carefully examines the major characters and provides a sequence of events or a structured plotline. The plot often follows a chronological sequence of events, but not always. Some narratives involve flashbacks or shifts between time periods.