9. THE MAUTHNER CELL
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Fig. 29. Responses recorded from the cell body of an orthodromically excited ( b ) -
( e ) and antidromically excited ( f )-( i ) group A2 motoneuron; the inhibition was
produced at various time intervals relative to the ipsilateral excitation. ( a ) Response in cell when crossed inhibition was produced alone. ( b ) Response to excitatory
Mauthner cell alone. ( f ) Response to ventral root excitation alone. Top trace: response in excitatory Mauthner cell. Second trace: response in inhibitory Mauthner
cell. Third trace: response in motoneuron at high gain. Bottom trace: response in
motoneuron at low gain. Calibrations: vertical, 2.0 mV (top two traces), 1.25 mV
(third trace), and 20 mV (bottom trace); horizontal, 1 msec.
complicating response of the inhibition alone seen in isolation in record
Fig. 2%). Fatigue, resulting from repetitive activation of the Mauthner
axon, usually acted in a similiar manner, causing the cell body response
to disappear first and that of the A1 unit last.
309
J
i
Fig. 29. Responses recorded from the cell body of an orthodromically excited ( b ) -
( e ) and antidromically excited ( f )-( i ) group A2 motoneuron; the inhibition was
produced at various time intervals relative to the ipsilateral excitation. ( a ) Response in cell when crossed inhibition was produced alone. ( b ) Response to excitatory
Mauthner cell alone. ( f ) Response to ventral root excitation alone. Top trace: response in excitatory Mauthner cell. Second trace: response in inhibitory Mauthner
cell. Third trace: response in motoneuron at high gain. Bottom trace: response in
motoneuron at low gain. Calibrations: vertical, 2.0 mV (top two traces), 1.25 mV
(third trace), and 20 mV (bottom trace); horizontal, 1 msec.
complicating response of the inhibition alone seen in isolation in record
Fig. 2%). Fatigue, resulting from repetitive activation of the Mauthner
axon, usually acted in a similiar manner, causing the cell body response
to disappear first and that of the A1 unit last.