¶ … prefrontal cortex and limbic system in the play years. What are their functions? How do they differ? What changes occur in a child's behavior as a result of a maturing limbic system and prefrontal cortex. The prefrontal cortex and the limbic system are very central in the early childhood development and in particular during the play years of the child. The prefrontal cortex is responsible for the triggering of the spontaneous activities, initiating drive in the growing kid, keeping the kid active and helping in the coordination of the movements and behavior (Michael H. Thimble, 1990). These are very significant aspects for a growing kid. On the other hand, the limbic system is the brain area that is very important especially in the regulation and expression of emotions. The limbic system is divided into three major portions as the Amygdala; which is a tiny part of the brain that is responsible for the registry of emotions. Hippocampus; is responsible for the processing of memory and in particular the memory of locations. Hypothalamus; this is the brain area that responds to the Amygdala and the hippocampus and in effect produces hormones that activate the other parts of the body and brain into activity (Cassie Landers, 2012).

A maturing of the limbic system and the prefrontal cortex will see the child having more coordinated movements, ability to balance...

Describe the process and timing in which prenatal, phenotypical sex determination occurs. Identify any chromosomes, genes, and hormomnes that might be involved in that process. What are the Wolffian and Mullerian processes, and what roles do they play in the development of male and female sex organs.
The human male determination is marked at about five weeks of the gestation with the differentiation of the testis. At this stage, the embryonic testis produces testosterone and the Mullarian. The Mullarian are powerful hormones that divert the developmental pathways particularly along the male lines. Here, the testis determining factor helps in the switching of the genital ridge (the indifferent gonad) to testis differentiation by the action of the genes. There are a number of genetic accidents like the lack of mutation of TDF or inhibition of the actions of the testosterone that can alter the male determination pathway, resulting into a phenotype of the baby being female. The male development is known as the "default pathway" and female commonly referred to as "mutant males" (Jennifer S. Marshall, 2012).

The function of the Wolffian and the Mullerian is particularly observable 15 days after…