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KMID : 0378019730160030057
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New Medical Journal
1973 Volume.16 No. 3 p.57 ~ p.61
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General activity of rats following damage to the mammillary bodies
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Abstract
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The function of the mammillary bodies was investigated in relation to general activity. Thirty-nine male rats were divided into two groups. One group of the animals received electrolytic lesion of the mammillary bodies through stereotaxically implanted electrodes (mammillary group, N=18), and the other group received the same treatment short of electrolytic lesion (operated control group, N=21). Experiment was begun 3 weeks following surgery. Each animal was put into an activity cage across which an infrared beam traversed. The number of beam interruption by the movement of the subject was recorded hourly, for 24 hours and was regarded as an index of general activity.
The results obtained were as follows:
1. Both the mammillary and the operated control groups interrupted beam significantly more often at night than in the daytime.
2. The mammillary group interrupted beam significantly more often at night and in 24 hours and insignificantly more often in the daytime than the operated control group did.
Based on the above results, it is inferred that in rats the mammillary bodies may exert an inhibi￢tory influence, especially at night, upon the central mechanism of general activity.
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