Tangential organization of olfactory, association, and commissural projections to olfactory cortex in a species of reptile (Trionyx spiniferus), bird (Aix sponsa), and mammal (Tupaia glis)

Brain, Behavior and Evolution
L C SkeenB R Schofield

Abstract

Small amounts of tritiated leucine were injected into the olfactory bulb or anterior olfactory cortex of softshell turtles, wood ducks, and tree shrews in order to compare quantitatively the laminar distribution of olfactory bulb, association, and commissural projections to olfactory cortex. In all three species, a similar colaminar distribution of olfactory and association projections was found: the olfactory projections are restricted to the superficial cortical layer Ia, while the association projections are distributed into the deeper cortical layers Ib, II, and III. Differences among these three species were found in the origin and distribution of commissural projections. Whereas in tree shrews these fibers originate from third-order neurons and project into the deeper layers of the contralateral cortex (with the homolateral olfactory bulb projections), in softshell turtles and wood ducks, they originate from second-order neurons and project into the superficial layer of the contralateral cortex (with the homolateral olfactory bulb projections). These results, in conjunction with those obtained previously in other species, indicate that the basic tangential organization of mammalian olfactory cortex is retained, albeit wit...Continue Reading

Citations

Feb 1, 1988·Behavioural Brain Research·A Gagliardo, A Teyssèdre
Jan 2, 1986·Neuroscience Letters·L C SkeenF E Douglas
Sep 4, 2007·The Veterinary Clinics of North America. Exotic Animal Practice·Jeanette Wyneken
Nov 14, 2013·The Journal of Comparative Neurology·Yasuro Atoji, J Martin Wild
Aug 21, 2021·Annual Review of Cell and Developmental Biology·Maria Antonietta Tosches

❮ Previous
Next ❯

Related Concepts

Related Feeds

Basal Ganglia

Basal Ganglia are a group of subcortical nuclei in the brain associated with control of voluntary motor movements, procedural and habit learning, emotion, and cognition. Here is the latest research.

Amygdala: Sensory Processes

Amygdalae, nuclei clusters located in the temporal lobe of the brain, play a role in memory, emotional responses, and decision-making. Here is the latest research on sensory processes in the amygdala.