An additional trigeminal system in certain snakes possessing infrared receptors.
D000818:Animals; D001931:Brain Mapping; D001933:Brain Stem / Q000033:anatomy & histology*; D009434:Neural Pathways; D011149:Pons / Q000033:anatomy & histology; D012911:Snakes / Q000033:anatomy & histology*; D013116:Spinal Cord / Q000033:anatomy & histology*; D014276:Trigeminal Nerve / Q000033:anatomy & histology*