Behavioral Consequences of Delta-Opioid Receptor Activation in the Periaqueductal Gray of Morphine Tolerant Rats

<table class="table-group" id="tab1"><tr><td><table class="table"><tr><td class="thead-hr" colspan="3"><hr/></td></tr><tr class="thead"><td align="center" colspan="3">Crouching/lying</td></tr><tr class="thead"><td align="left">Pretreatment</td><td align="center">25–39 minutes</td><td align="center">40–54 minutes</td></tr><tr><td class="thead-hr" colspan="3"><hr/></td></tr><tr><td align="left">Saline</td><td align="center">0% (0/6)</td><td align="center">0% (0/6)</td></tr><tr><td align="left">Morphine 10 mg</td><td align="center">20% (1/5)</td><td align="center">67% (6/9)</td></tr><tr><td align="left">Morphine 20 mg</td><td align="center">36% (4/11)</td><td align="center">40% (6/15)</td></tr><tr class="table-tr"><td colspan="3"><hr class="tbody-hr"/></td></tr></table></td></tr><tr class="table-fn"><td>Note: sample sizes are shown in parentheses.<br/></td></tr></table>

Percentage of
rats showing normal and abnormal behavior following deltorphin microinjection
into the vPAG in morphine-pretreated rats.

Neural Plasticity

tab1

Table 1

Table 1: Behavioral Consequences of Delta-Opioid Receptor Activation in the Periaqueductal Gray of Morphine Tolerant Rats 