Which brain region is believed to play a critical role in ocd?

The Brain region that is believed to play a critical role in OCD, is the orbital frontal cortex. Obsessive compulsive and related disorders are a group of overlapping disorders that generally involve intrusive, unpleasant thoughts and repetitive behaviors. An individual experiences thoughts and urgents that are intrusive and unwanted and/or the need to engage in repetitive behaviors or mental acts.