[Comparative study of formation of the frontal cortex of the brain of monkeys and man in ontogenesis].

  • 1 March 1975
    • journal article
    • research article
    • Vol. 68  (3) , 43-9
Abstract
The development of the fields of the frontal zone (8, 3, 10, 11, 12) were compared in the pre- and postnatal periods oflife in the nacaque-rhesus and man. The cyto-mielcarchitectonical and guantitative methods wereused. The square surfaces of the above fields were measured, their per cent ratios to thesquare surface of all the cortex, new cortex and frontal zone were calculated. The work hasrevealed the following: 1. General regularities in the development of frontal zones in monkeysand man: a) shorter terms for the formation of philogenetically old fields-11, 12, 8 andlonger terms for the new ones-9 and 10:b) predominant development of the frontal zone at theexpense of progressive young fields 9 and 10: c) predominat formation of the frontal zone bothkinds of primates in the postnatal period. 2. The specific features for each field (the termsfor isolation of the fields, the rate and direction of their development). 3. Substantial difference: more rapid maturation of the frontal zone in macaques (by the 6th -12th months of life)and more prolonged one in humans-by 12 years. A considerable growth of philogenetically newstructures (fields 9 and 10) in the system of all the cortex and the frontal zone wasshown in man as compared with monkey. The experimental ontogentical material is interpreted.

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