In what ways do male and female brains differ physically? What does this differ

Many anatomical differences between the sexes exist in animal brains.  For example, research shows that women’s brains have an average of 11 percent more cells in areas of cortex associated with processing auditory information; part of the frontal cortex is larger in women; men tend to use the right side of the amygdala while encoding and storing emotional scenes, whereas women tend to use the left side; differences exist in areas related to reproduction such as the hypothalamus; and women appear to use both hemispheres in tasks involving language, while men tend to use only the left hemisphere.
Supposed gender differences in behavior actually reflect stereotypes about males and females.
The overlap between the sexes is greater than the differences between them.
A brain difference does not necessarily explain behavior or performance.
Sex differences in the brain could be the result, rather than the cause, of behavioral differences.
It is simply not known whether any of the findings are important for how men and women perform and function in everyday life.