anterolateral sulcus of medulla anterolateral sulcus of medulla the anterolateral sulcus (or ventrolateral sulcus) is a sulcus on the side of the medulla oblongata between the olive and pyramid. the rootlets of the hypoglossal nerve (cn xii) emerge from this sulcus. anterolateral sulcusanterolateral sulcus is visible at #8.anteroinferior view of the medulla oblongata and pons. (anterolateral sulcus visible but not labeled.)detailsidentifierslatinsulcus anterolateralis medullae oblongataeneuronames710ta98a14.1.04.005ta25986fma83797anatomical terms of neuroanatomy