Correct option is D
Brain convolutions refer to the folded structure of the cerebral cortex, which consists of raised areas called gyri (singular: gyrus) and grooves called sulci (singular: sulcus). These convolutions are evolutionary adaptations that allow a larger surface area of neural tissue to fit within the confines of the skull, representing the most recent evolutionary development in brain structure.
Information Booster - Brain Convolutions:
• Gyri are the raised folds or ridges on the surface of the cerebral cortex
• Sulci are the grooves or furrows between the gyri that create the folded appearance
• This folding pattern increases the surface area of the cortex by approximately 3-fold
• The convolution pattern is highly conserved across mammalian species but varies in complexity
• More complex brains tend to have more elaborate convolution patterns
• The folding occurs during fetal development as the brain grows rapidly within the skull
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