GABAergic feedforward projections from the inferior colliculus to the medial geniculate body.
A novel and robust projection from gamma-aminobutyric acid-containing (GABAergic) inferior colliculus neurons to the media] geniculate body (MGB) was discovered in the cat using axoplasmic transport methods combined with immunocytochemistry. This input travels with the classical inferior colliculus projection to the MGB, and it is a direct ascending GABAergic pathway to the sensory thalamus that may be inhibitory. This bilateral projection constitutes 10-30% of the neurons in the auditory tectothalamic system. Studies by others have shown that comparable input to the corresponding thalamic visual or somesthetic nuclei is absent. This suggests that monosynaptic inhibition or disinhibition is a prominent feature in the MGB and that differences in neural circuitry distinguish it from its thalamic visual and somesthetic counterparts.
Winer
J A
JA
Division of Neurobiology, Department of Molecular and Cell Biology, University of California at Berkeley, 94720-3200, USA.
Saint Marie
R L
RL
Larue
D T
DT
Oliver
D L
DL
D000344:Afferent Pathways / Q000033:anatomy & histology / Q000502:physiology; D000818:Animals; D001370:Axonal Transport; D002415:Cats; D007839:Functional Laterality; D005829:Geniculate Bodies / Q000033:anatomy & histology / Q000502:physiology*; D006735:Horseradish Peroxidase; D007245:Inferior Colliculi / Q000033:anatomy & histology / Q000502:physiology*; D008959:Models, Neurological; D009474:Neurons / Q000166:cytology* / Q000502:physiology*; D018998:Wheat Germ Agglutinin-Horseradish Peroxidase Conjugate; D005680:gamma-Aminobutyric Acid / Q000032:analysis*
D018998:Wheat Germ Agglutinin-Horseradish Peroxidase Conjugate; C062844:wheat germ agglutinin-apohorseradish peroxidase conjugate gold complex; D005680:gamma-Aminobutyric Acid; D006735:Horseradish Peroxidase