part of part of incisive canal anatomical conduit space incisive duct horses exhibit Flehmen response but do not have an incisive duct communication between the nasal and the oral cavity because they do not breathe through their mouths, instead, the VNOs connect to the nasal passages by the nasopalatine duct FMA:77282 Taxon notes notes: In domestic mammals the Ductus incisivus is considerably better developed than in man. It is not accommodated in a Canalis incisivus, as in man, but in the Fissura palatina[NOMINA ANATOMICA VETERINARIA (2005)] ductus incisivus An infrequent rudimentary duct, or protrusion of the mucous membrane into the incisive canal, on either side of the anterior extremity of the nasal crest. UBERON:0036144