Starting Point: Posterior extent of superior temporal sulcus, main body
Direction: Anterior to Posterior
Ending Point: Most posterior high contrast point closest to the junction of the intraparietal and transverse occipital sulci.
Notes: This sulcus may not always be present, but when it is make sure to draw it along the path of least resistance. Occiasionally this sulcus runs into the temporo-occipital sulcus, if so, stop there.