Publisher Summary This chapter discusses anatomical, biochemical, and neurophysiological changes with the development of functional and behavioral patterns of brain that indicate the necessary degree of maturation required for various functions. The neurological maturation of the brain assessed with the concomitant chemical and anatomical development considers various factors in the total development of the animal. These factors include the rate of prenatal development, a correlary of which is the maturity of the animal at birth, and the rate of postnatal development. Other important points are the complexity of the brain organization and the total metabolic rate of the animal as a whole as well as that of the brain itself. The data used in the chapter were obtained on whole brain and reported on a wet weight basis. The human infant is born more mature than that of the rat or rabbit, and based on the visual evoked potential, more mature than the cat. After birth, development in man appears to proceed more slowly than in the other species examined.

Biochemical and Neurophysiological Development of the Brain in the Neonatal Period

1. The effect of pentothal anesthesia was examined in 9 subjects on whom 19 observations were made. Blood was drawn simultaneously from the right and left internal jugular veins and the femoral artery in order to determine the right and left cerebral arteriovenous oxygen differences and the right and left cerebral blood flows, which were measured according to the method of Kety and Schmidt to calculate cerebral metabolic rate. When results from both right and left sides are averaged, the oxygen consumption of the brain in the unanesthetized man is 3.3 cc. oxygen/100 gm. of tissue/minute. This value, however, represents two groups: a higher one with 3.9 cc. oxygen/100 gm. of tissue/minute and a lower with 2.7. Because of the asymmetric venous return, the cortical component usually appears preponderantly in one of the two internal jugular veins and it is concluded that the portion of the brain with the higher metabolic rate is the cortex. 2. In every instance, pentothal anesthesia induced a depression in me...

Brain metabolism in man: unanesthetized and in pentothal narcosis

Some evidence on the functional organization of the brain.

Surgical physiology of acute head trauma.

Criteria for the stages of pentothal anesthesia.

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Criteria for the stages of pentothal anesthesia.