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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Neurones in the adult rat anterior medullary velum.

The presence of neurones in the rat anterior medullary velum (AMV) has been investigated by using antibodies to the calcium-binding proteins, parvalbumin (PV), calretinin (CR), and calbindin-D28k (CB). Disparate populations of mainly GABAergic neurones were located in the rostral and caudal regions of the AMV. The rostral region of the AMV was characterised by GABAergic CR-labelled or PV-labelled neurones. CR-labelled neurones were bipolar or multipolar with round to ovoid somata (diameters between 8 and 12 microm), and rostrocaudally running dendrites forming a network. PV-labelled neurones had round somata (diameters between 6 and 10 microm) and were bi-tufted, with beaded dendrites. Both CR-labelled and PV-labelled dendrites formed punctate pericellular associations with unlabelled somatic profiles. In the caudal region of the AMV, PV-labelled neurones were GABAergic, multipolar cells, having round somata (diameters between 9 and 12 microm), with either beaded or nonbeaded dendrites forming a network of interconnecting dendrites. PV-labelled pericellular associations were made around both PV-labelled and unlabelled somatic profiles. CR labelled unipolar brush cells (UBCs) were not GABAergic. UBCs were characterised by a round to oval somata (10-15 microm in diameter) from which a single primary dendrite emerged to form a distal expansion having small terminal dendrites. From the distal expansion, there also appeared to be CR-labelled processes emanating and extending for up to 250 microm. CB occasionally labelled "Purkinje-like cells" (PLCs). The rat AMV is a more complex structure than first envisaged with the presence of predominantly inhibitory neurones expressing different calcium-binding proteins. Functional and anatomic aspects of this circuitry are further discussed.[1]


  1. Neurones in the adult rat anterior medullary velum. Ibrahim, M., Menoud, P.A., Celio, M.R. J. Comp. Neurol. (2000) [Pubmed]
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