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An atlas of glycine- and GABA-like immunoreactivity and colocalization in the cochlear nuclear complex of the guinea pig

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Summary

The distribution and colocalization of γ-aminobutyric acid (GABA)- and glycine-like immunoreactivity in the cochlear nuclear complex of the guinea pig have been studied to produce a light microscopic atlas. The method used was based on post-embedding immunocytochemistry in pairs of 0.5-μm-thick plastic sections treated with polyclonal antibodies against conjugated GABA and glycine respectively. Immunoreactive cells, presumably short axon neurones, predominated in the dorsal cochlear nucleus, with mostly single-GABA-labelled cells in the superficial layer, double-labelled in the middle, and single-glycine-labelled in the deep layers. A few large single-glycine-labelled cells, interpreted as commissural neurons, occurred in the ventral nucleus. Scattered double-labelled cells, probably Golgi cells, were seen in the granule cell domain. Immunolabelled puncta of all three staining categories occurred in large numbers throughout the complex, apposed to somata and in the neuropil, showing a differential distribution onto different types of neuron. Three immunolabelled tracts were noted: the tuberculoventral tract, the commissural acoustic stria, and the trapezoidal descending fibres. Most of the fibres in these tracts were single-labelled for glycine, although in the last mentioned tract single-GABA- and double-labelled fibres were also found. Some of the immunolabelled cell types described here are proposed as the origins of the similarly labelled puncta and fibres on the basis of known intrinsic connections.

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Abbreviations

1-4 :

DCN layers 1 to 4

as :

acoustic stria

AVCN :

anteroventral cochlear nucleus

C :

caudal

cap :

cap area

cas :

commissural acoustic stria

cnr :

cochlear nerve root

co :

commissural cell

CRVCN :

central region of the VCN

cw :

cartwheel cell

CZ :

confluence zone

d :

dendrite

D :

dorsal

das :

dorsal acoustic stria

DCN :

dorsal cochlear nucleus

df :

descending fibres

ep :

ependyma

flocc :

flocculus

g :

glial cell

GABA :

γ-aminobutyric acid

GLY :

glycine

gi :

giant cell

gl/gla :

globular cell/area

Go :

Golgi cell

gr :

granule cell

ias :

intermediate acoustic stria

icp :

inferior cerebellar peduncle

lam :

granule cell lamina

mp/mpa :

multipolar cell/area

oc/oca :

octopus cell/area

PVCN :

posteroventral cochlear nucleus

py :

pyramidal cell

R :

rostral

sgl :

superficial granule cell layer

spcg :

subpeduncular corner of granule cells

sph/spha :

spherical cell/area

st :

stellate cell

tb :

trapezoid body

tv :

tuberculoventral cell

TVT :

tuberculoventral tract

V :

ventral

VCN :

ventral cochlear nucleus

vn :

vestibular nerve

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Kolston, J., Osen, K.K., Hackney, C.M. et al. An atlas of glycine- and GABA-like immunoreactivity and colocalization in the cochlear nuclear complex of the guinea pig. Anat Embryol 186, 443–465 (1992). https://doi.org/10.1007/BF00185459

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