= Defining SMA = How to define SMA on anatomy. Think this is wrong? Let MatthewBrett know. This text and pictures stolen with gratitude from Sam Burnand and Rich Armstrong. The pre-SMA and SMA proper were defined with the following boundaries (Picard and Strick, 2001). {{attachment:sma_coronal.png}} {{attachment:sma_sagittal.png}} * Inferior border: Cingulate sulcus * Superior border: Medial fold of cortex All following vertical borders are perpendicular to the AC-PC line; the line joining anterior and posterior commissures. * Anterior border: anterior border of the genu of the corpus callosum * Posterior border: posterior commissure Separation into pre-SMA and SMA proper (pre-SMA is anterior): anterior commissure