Afferent and efferent connections of the lateral and medial pallia of the silver lamprey

Brain, Behavior and Evolution
R Glenn Northcutt, H Wicht

Abstract

Injections of the carbocyanine dye, DiI, into the lateral pallium of the silver lamprey reveal that this pallial region receives bilateral inputs from the olfactory bulbs, dorsomedial telencephalic neuropil, and the habenular nuclei, and ipsilateral inputs from the septum, preoptic area, medial pallium, thalamus, and, possibly, the striatum. The efferent projections of the lateral pallium form dorsal (olfacto-habenular tract of Heier) and ventral (olfacto-thalamic and hypothalamic tracts of Heier) bundles. The dorsal bundle terminates ipsilaterally in the dorsal pallium, medial pallium, habenular nuclei, and pretectum and contralaterally in the habenular nuclei and, possibly, the dorsal pallium. The ventral bundle terminates ipsilaterally in the septum, striatum, and preoptic areas and bilaterally within the hypothalamus. Injections of DiI into the medial pallium reveal bilateral inputs to this pallial formation from the olfactory bulbs, the dorsomedial telencephalic neuropil, septum, habenular nuclei, thalamic nuclei, preoptic area and hypothalamus, as well as ipsilateral inputs from the lateral pallium, dorsal isthmal grey and midbrain tegmentum. The efferent projections of the medial pallium form dorsal, ventral and descendi...Continue Reading

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