The term annectant gyrus (ANN) refers to a buried convolution of the parietal lobe (PLB) defined by dissection in the human ( Duvernoy-1992 ) and the macaque ( Martin-2000 ). It is located caudally in the floor of the intraparietal sulcus (ips) of the macaque ( Kappers-1960 ). It extends a short way along the floor of the lunate sulcus of the human (lush) at its junction with the ips ( Martin-2000; Dubach-2008, Duvernoy-1992 ). In the human, small topologically similar but unnamed convolutions appear in the depths of the ips as well ( Duvernoy-1992; Mai-1997 ). Equivalent structures are not found in the smooth cerebral cortex of the rat or mouse ( NeuroNames ). In the macaque, ANN is the location of histologically defined area V3D caudally and area V3A rostrally ( Paxinos-2009a ). Updated 28 May 2025.