Asymmetry and unequal thickness of the posterior parietal cortex

Abstract

Sažetak. Istraživanja asimetrije i funkcionalnih razlika pojedinih oblasti moždane kore, često otvaraju nova pitanja, posebno kada je reč o zadnjem delu temenog režnja, koji ima izuzetno složenu funkciju. Lobulus parietalis superior (LPS) i precuneus (P) su delovi iste zadnje parijetalne kortikalne oblasti (5 i 7). Utvrđivane su razlike u debljini kore LPS na spoljašnjoj i P na unutrašnjoj strani hemisfere, kao i razlike između leve i desne strane. Merena je dužina hemisfera 20 mozgova odraslih osoba oba pola. Rezovi levog i desnog LPS i P obojeni su po Nisslu. Posebno su analizirani slučajevi sa većom levom, odnosno većom desnom hemisferom. Kod većih levih hemisfera (15 mozgova) kora levog LPS (3,76 mm) bila je značajno (p<0,001) deblja u odnosu na levi P (3,13 mm), bez drugih značajnih razlika. Kod većih desnih hemisfera (5 mozgova) nije bilo značajne razlike u debljini kore P desno (3,34 mm) i levo (3,13 mm), kao ni levog (3,76 mm) i desnog LPS (3,67 mm). Međutim, u tim slučajevima kora desnog LPS (3,66 mm) bila je značajno deblja (p<0,05) od kore desnog P (3,33 mm), a kora levog LPS (3,67 mm) bila je značajno (p<0,05) deblja od kore levog P (3,35 mm). Kod većih desnih hemisfera zadnji parijetalni korteks je obostrano deblji na spoljašnjoj strani hemisfere, dok kod većih levih hemisfera to važi samo za levu hemisferu. U obe grupe značajno je deblja kora LPS od P.Ključne riječi: Kora mozga, Parijetalni režanj opened new issues, particularly in terms of the posterior parietal lobe, which has a very complex function. Lobulus parietalis superior (LPS) and precuneus (P) are parts of the same rear parietal cortical area (5 and 7). There were established the differences in the thickness of the LPS cortex on the outer and P on the inner side of the hemisphere, as well as the differences between the left and the right side. It was measured the hemisphere length of 20 brains of both male and female adults. Section of the left and right LPS and P were colored according to Nissl. The cases with larger left and right hemisphere, respectively, were particularly analyzed. In larger left hemispheres (15 brains), cortex of the left LPS (3.76 mm) was significantly (p<0.001) thicker relative to the left P (3.13 mm), without other significant differences. In larger right hemispheres (5 brains), there was no significant difference in the cortex thickness of the P on the right (3,34 mm) and left (3.13), nor in the left (3.76) and right (3.67 mm) LPS. However, in such cases, the right LPS cortex (3.66 mm) was significantly thicker(p<0,05) than the right P cortex (3.33 mm), and the left LPS cortex (3.67 mm) was significantly thicker(p<0.05) than the left P cortex (3.35 mm). In larger right hemispheres, the rear parietal cortex was thicker on both sides of the outer hemisphere, while in larger left hemispheres it was the case only on the left hemisphere. In both groups, the LPS cortex was significantly thicker than the P cortex.