For instance, the cerebellum, located in the hind brain is responsible for motor movements, such as handwriting.
[6] Twins are more prone to perinatal injuries and are statistically more likely to have a premature birth compared to singletons.
In a recent analysis, it was even determined that there is no specific developmental complication that contributes to the higher prevalence of left-handedness between monozygotic and dizygotic twins.
[5] There is no conclusive evidence to support the idea that a certain type of twin may have a higher prevalence of left-handedness because the results from studies conducted contradict one another.
[5] Further studies addressing the topic need to be performed to come to a conclusive answer on whether a type of twin or gender affects handedness.
During the early development of monozygotic twins, the time in which the embryo divide has an impact on placentation.
If the split of the embryo occurs within three days of fertilization, two individual placentas are formed resulting in monozygotic dichorionic twins.
If the split of the embryo occurs between 3 and 12 days after fertilization, a placenta will be shared between the offspring resulting in monozygotic monochorionic twins.
[5] When in the embryo, after the axis of bilateral symmetry is established, twins are facing each other and would develop traits opposite of one another because their actions are perceived to be matching.