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Lissencephaly (/ ˌ l ɪ s. ɛ n ˈ s ɛ f. ə l. i /, meaning 'smooth brain') [1] is a set of rare brain disorders whereby the whole or parts of the surface of the brain appear smooth. [2] It is caused by defective neuronal migration during the 12th to 24th weeks of gestation, resulting in a lack of development of brain folds and grooves . [3]
The development of the nervous system in humans, or neural development, or neurodevelopment involves the studies of embryology, developmental biology, and neuroscience.These describe the cellular and molecular mechanisms by which the complex nervous system forms in humans, develops during prenatal development, and continues to develop postnatally.
With the brain, this process happens early in development, again during puberty, and pregnancy probably reflects another wave of cortical refinement.” Increase in brain white matter during pregnancy
Pyroclasts include juvenile pyroclasts derived from chilled magma, mixed with accidental pyroclasts, which are fragments of country rock.Pyroclasts of different sizes are classified (from smallest to largest) as volcanic ash, lapilli, or volcanic blocks (or, if they exhibit evidence of having been hot and molten during emplacement, volcanic bombs).
Embryonic vertebrate subdivisions of the developing human brain hindbrain or rhombencephalon is a developmental categorization of portions of the central nervous system in vertebrates. It includes the medulla , pons , and cerebellum .
Increased levels of prolactin in the paternal brain has also been correlated with a more positive response to the infant's cry. Experienced fathers of newborns show a significantly greater increase in prolactin after hearing their baby's cries or holding their babies than first-time fathers, suggesting that learning is important for males to ...
In humans, by 5 weeks in utero it is visible as a single portion toward the front of the fetus. At 8 weeks in utero, the forebrain splits into the left and right cerebral hemispheres. When the embryonic forebrain fails to divide the brain into two lobes, it results in a condition known as holoprosencephaly. The main structures of the forebrain ...
According to one hypothesis, the holoprosencephalic brain is due to an incomplete axial twisting. [6] According to the axial twist theory, each side of the brain represents its opposite body side because the anterior part of the head, including the forebrain, is turned around by a twisting along the body axis during early development.