Asymmetrical relationships between the right and left heights of the sylvian end points in right- and left-pawed male and female cats: similarities with planum temporale asymmetries in human brain.
Asymmetry in the height of the right (R) and left (L) Sylvian end points was studied in right- (RH) and left-pawed (LH) male and female cats. Sylvian height was described relatively to brain weight. An asymmetry coefficient (AC) was estimated (R - L/.5*R + L). There was no significant relationship between R + L Sylvian height and AC, in the total sample and in AC- (leftward asymmetry) brains. In AC+ brains (rightward asymmetry), R + L Sylvian height showed an inverse correlation with AC in RH cats, and a direct correlation in LH cats. There was an inverse correlation between left Sylvian height and AC in RH cats, but no correlation in LH cats. There was a direct correlation between right and left Sylvian height and AC. In AC- brains, left Sylvian height had no relation to AC, but there was a direct correlation between right Sylvian height and AC. In AC+ brains, left Sylvian height showed an inverse correlation with AC in RH males and females; a direct correlation only in LH male cats. Right Sylvian height showed a direct relation to AC+ values in RH and LH males and LH females (no correlation in RH females). The results supported the generalization that a brain symmetrical in a given region has more combined cortex than a brain that is asymmetrical for this region, only for RH cats, however (Galaburda et al., 1987).
Tan
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U
Ataturk University, Medical Faculty, Department of Physiology, Erzurum, Turkey.
Kutlu
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N
D000818:Animals; D001921:Brain / Q000033:anatomy & histology* / Q000502:physiology; D002415:Cats / Q000033:anatomy & histology*; D002540:Cerebral Cortex / Q000033:anatomy & histology / Q000502:physiology; D004967:Estrogens / Q000502:physiology; D005260:Female; D007839:Functional Laterality / Q000502:physiology*; D006801:Humans; D008297:Male; D008954:Models, Biological; D012737:Sex Factors; D013739:Testosterone / Q000502:physiology
D004967:Estrogens; D013739:Testosterone