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Introduction: Precise estimation of gestational age is the key to proper antepartum care. Ultrasonographic estimation of fetal age using various fetal parameters is utilized for accurate estimation because estimation by last menstrual period is not reliable in all cases. Objectives: To assess gestational age with the help of ultrasonographic measurements of fetal biparietal diameter in the local population of the region of Udaipur district of Rajasthan and thereby evaluate significance of this fetal biometric parameter in the prediction of gestational age by ultrasound. Subjects and Methods: Data of Ultrasonographic measurements and patient history was taken from the past records. Statistical analysis: Mean, standard deviation, statistical significance and t test were calculated. Results: The ultrasonographic measurement of biparietal diameter is a reliable indicator of gestational age in second and third trimesters. Conclusion: The derived gestational age is comparable with that used by Hadlock et al.

Background: Cortical folding is a hallmark of many but not all mammalian brains. The degree of folding gradually increases with the size of brains in mammals but at different range between the families.Gyrification is a process which varies widely in mammals in early foetal and prenatal life.Materials: This study was conducted on 100 dead foetuses in anatomy department, brought from the department of Obstetrics and gynaecology of MNR Medical College and Hospital. Results:The brain surface is smooth up to 12 weeks,Cingulate sulcus appeared by 16-18weeks.Growth of adjoining lobes of brain make surface more convoluted with well-defined sulci and gyral pattern between 30-32 weeks. Conclusion:Cortical folding is due to consequence of restricted space and rapid growth of brain with in the cranial cavity. There is no differences between male and female brains of same gestational age, with no obvious asymmetrical development of gyri on different lobes of brain.

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