Extended Data Fig. 3: Relay of trigeminal input to thalamus, related to Fig. 3.
From: The evolutionary origin of visual and somatosensory representation in the vertebrate pallium
a, Schematic showing the location of the trigeminal sensory nucleus (dotted square) and the injection site in contralateral thalamus (blue) to retrogradely label neurons in the trigeminal sensory nucleus referred to also as the nucleus of the radix descendens nervi trigemini. b, Photomicrograph showing retrogradely labelled neurons in the trigeminal sensory nucleus projecting to thalamus. c, Transverse schematics showing the location of retrogradely labelled neurons projecting to the contralateral thalamus (blue dots) in the trigeminal sensory nucleus, as well as the descending root of the trigeminal nerve (magenta). d, Confocal photomicrograph showing a retrogradely labelled cell of the trigeminal sensory nucleus projecting to thalamus (blue) sending its dendrite into the trigeminal tract (magenta) where it receives synapses (green) from the descending root of the trigeminal nerve f. Box diagram showing the trigeminal sensory pathway from the trigeminal sensory nerve to the somatosensory cortex. drV, descending root of the trigeminal nerve; IX, glossopharyngeal motor nucleus; X, vagus motor nucleus; PRRN, posterior rhombencephalon reticular nucleus.
