Relationship between the Brain Volume and IQ in Children 9-11 Years of Age in Ahwaz.

Anthropology is a branch of biological sciences that estimates the quantitative measurement of different parts of the body. Cephalometry, which is part of anthropology concern with the anatomical index of head and neck. The human brain develops mostly in embryonic period with high speeding 6 years of life. Due to the complication of nervous system, there are some questions: What is the intelligence? Whether high intelligent people have larger brain? In this study we tried to fine out the correlation between head size, brain volume and head circumference. in this study 560males and 497 females at the age 9-11 years in Ahwaz city were examined. Selection of people was randomly with convenient sampling. The length, wide, height, and circumference of the head were measured with the cephalometric equipments. From length, wide and height of head, the brain volume was calculated. For determination of intelligence Raven Children Test (Psychometric Test No.1) was used. SPSS for windows, T test, Mann-Whitney and Pearson method were used for analyzing the data.in this study it was found the relationship between head circumference and intelligence was not significant especially in females (P>0.05) Pearson method analysis showed weak correlation between brain volume and intelligence in male but this result was not confirmed for females. The mean of head circumference was 1 cm longer than females. The mean of brain volume was 141.4 cm3 in males. The difference between the brain volume in females and males was significant (P<0.001). The mean of intelligence in females was higher than males.According to our finding the brain volume in males was greater than females; the intelligence in females was slightly more than males. It seems that the intelligence had no correlation with brain volume and head circumference. It seems that other factors may affect the intelligence.