Excursus
Encyclopedia
An excursus is a short episode or anecdote in a work of literature http://www.thefreedictionary.com/excursus. Often excursuses have nothing to do with the matter being discussed by the work, and are used to lighten the atmosphere in a tragic story, a similar function to that of satyr play
Satyr play
Satyr plays were an ancient Greek form of tragicomedy, similar in spirit to burlesque. They featured choruses of satyrs, were based on Greek mythology, and were rife with mock drunkenness, brazen sexuality , pranks, sight gags, and general merriment.Satyric drama was one of the three varieties of...

s in Greek theatre. Sometimes they are used to provide backstory to the matter being discussed at hand, as in Pseudo-Apollodorus' Bibliotheke. Furthermore, an excursus is often applied to a piece of academic writing to provide digressive information, which does not contribute directly to the line of argument, but can still be linked with the overall topic of the text.

Etymologies as excursuses

Sometimes detailed or fanciful etymologies
Etymology
Etymology is the study of the history of words, their origins, and how their form and meaning have changed over time.For languages with a long written history, etymologists make use of texts in these languages and texts about the languages to gather knowledge about how words were used during...

 are used as excursuses. This was used as early as the 5th Century BC by the poet Pindar
Pindar
Pindar , was an Ancient Greek lyric poet. Of the canonical nine lyric poets of ancient Greece, his work is the best preserved. Quintilian described him as "by far the greatest of the nine lyric poets, in virtue of his inspired magnificence, the beauty of his thoughts and figures, the rich...

. The most famous case of etymologies being used as excursuses is in The Golden Legend of Jacobus de Voragine
Jacobus de Voragine
Blessed Jacobus de Varagine or Voragine was an Italian chronicler and archbishop of Genoa. He was the author, or more accurately the compiler, of Legenda Aurea, the Golden Legend, a collection of the legendary lives of the greater saints of the medieval church that was one of the most popular...

, in which the life of each saint is proceeded by an etymology about the origin of the saint's name.
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