Mossy fibre sprouting continues from one week to two months after injury.
3.
Stimulation of aberrant mossy fibre areas increases the excitatory postsynaptic potential response.
4.
Each granule cell is receiving an input from two different mossy fibre inputs.
5.
Aberrant mossy fibre sprouting may create excitatory feedback circuits that lead to temporal lobe seizures.
6.
Additionally the GABA acts on GABA-B receptors which are located presynaptically on the mossy fibre terminal.
7.
These inhibit the mossy fibre evoked EPSCs of the granule cell in a temperature and frequency dependent manner.
8.
In TLE, the sprouting mossy fibres are larger than in the normal brain and their connections may be aberrant.
9.
Also, in animal models, granule cell hyper-excitability is recorded before aberrant mossy fibre sprouting has occurred.
10.
Marr proposed that the granule cells encode combinations of mossy fibre inputs, and that the climbing fibres carry a " teaching " signal that instructs their Purkinje cell targets to modify the strength of synaptic connections from parallel fibres.
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