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The Sylvian point represents the site of divergence of the three limbs of the Sylvian fissure. It lies 1¹⁄₄ inches behind the malar tubercle and 1¹⁄₂ inches above the upper border of the zygoma. The main posterior horizontal limb passes backwards and upwards to a second point situated ³⁄₄ inch below the parietal prominence.

The vertical limb is directed upwards for about 1 inch, whilst the anterior horizontal limb passes forwards for about the same distance.