coming soon
The transition from the embryonic period to the prefetal period is defined by the size of the embryo and its ability to make hand connections. At this stage, the head is notably larger in proportion to the rest of the body, and the forebrain exhibits dominance over other parts of the nervous system. By the 10th week, the volume of the hemispheres comprises roughly half of the entire brain volume. The lateral sulcus initially emerges on the dorsolateral surface of the brain. By the 10th week, a small groove appears between the frontal and temporal lobes, indicating the prospective location of the insula. During this developmental phase, the fold of the temporal lobe within the forebrain becomes evident for the first time.
The cortical plate can only be distinguished from the lateral side. In this area, the differentiation of the neocortex begins: the neocortical plate is divided into 2 sublayers: external and internal. The outer sublayer (marginal zone) will subsequently become the first layer of the cortex, and the inner sublayer (the cortical plate itself) will be the starting zone for the formation of the remaining layers of the cortex. The medial surface is characterized by an extremely thin hemisphere wall.
The basal (ventral) wall is strongly thickened and protrudes into the ventricular cavity, forming a eminence in the lateral ventricle (eminentia ventricularis). In the early stages it can be divided into medial and lateral parts (eminentia ventricularis medialis et lateralis). The striatum is formed from the eminence of the lateral ventricle even in earlier stages.
The midbrain is entirely open.
The transition from the embryonic period to the prefetal period is defined by the size of the embryo and its ability to make hand connections. At this stage, the head is notably larger in proportion to the rest of the body, and the forebrain exhibits dominance over other parts of the nervous system. By the 10th week, the volume of the hemispheres comprises roughly half of the entire brain volume. The lateral sulcus initially emerges on the dorsolateral surface of the brain. By the 10th week, a small groove appears between the frontal and temporal lobes, indicating the prospective location of the insula. During this developmental phase, the fold of the temporal lobe within the forebrain becomes evident for the first time.
The cortical plate can only be distinguished from the lateral side. In this area, the differentiation of the neocortex begins: the neocortical plate is divided into 2 sublayers: external and internal. The outer sublayer (marginal zone) will subsequently become the first layer of the cortex, and the inner sublayer (the cortical plate itself) will be the starting zone for the formation of the remaining layers of the cortex. The medial surface is characterized by an extremely thin hemisphere wall.
The basal (ventral) wall is strongly thickened and protrudes into the ventricular cavity, forming a eminence in the lateral ventricle (eminentia ventricularis). In the early stages it can be divided into medial and lateral parts (eminentia ventricularis medialis et lateralis). The striatum is formed from the eminence of the lateral ventricle even in earlier stages.
The midbrain is entirely open.