The palatal tunnel.
D000328:Adult; D000367:Age Factors; D002675:Child, Preschool; D006801:Humans; D007223:Infant; D007231:Infant, Newborn; D010159:Palate / Q000033:anatomy & histology*; D013391:Sucking Behavior; D014059:Tongue / Q000033:anatomy & histology / Q000502:physiology; D014886:Weaning