What is the significance of Mbaino in Things Fall Apart?

Mbaino is the village which Ikemefuna lives in before he is forced to live with Okonkwo in Umuofia in order to repent his father's crime.

It is significant because in essence, things begin to "fall apart" for Okonkwo after Ikemefuna is killed by Umuofia. Okonkwo becomes haunted by his choice to kill Ikemefuna. In fact, Ikemefuna's death begins Okonkwo's downfall.