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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DOI: https://doi.org/10.1007/BF00185459