Figure 4.

Complex CC orifice associated with flaps. (A) Corresponding OW (top) and IW (bottom) showing flap-structure on OW overlying orifice at the junctional region of the IWs and OWs (red arrow). Lip of the orifice (IW panel, middle) is delineated by three red dashes on the top and a red arrow, which points to the darkened orifice region. Extensions and corresponding anchor sites on IWs and OWs are labeled a and b. Anterior and posterior are labeled in OW and IW wedges. (B) Enlargement of Figure 4A OW (top) near region labelled “b” showing underlying fibrous structure of anchoring tether (T) and tubule-like structure (arrow).