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.
The setting of a story describes the environment that events take place in. It includes location, time period, culture, mood and other atmospheric qualities. The theme is the central idea of a story or narrative. It summarizes what the story is about. Themes often involve an issue, lesson or cause that is represented in the story. The plot of a narrative is shaped by the events that unfold. It typically includes a conflict or problem, a climax, and a resolution.