What is a defining characteristic of Tanner Stage II in male development?

In Tanner Stage II of male development, one of the key characteristics is the enlargement of the testicles and the darkening of the scrotum. This stage represents the beginning of puberty and is marked by significant changes in the male reproductive system.

During this stage, there is a noticeable increase in the size of the testicles, which indicates the initiation of spermatogenesis and hormonal changes in the body. Additionally, the scrotum becomes more pigmented, reflecting hormonal influences on the skin.

While other changes such as growth of the penis, development of pubic hair, and further physical changes do occur in subsequent stages, it is specifically the enlargement of the testicles and the darkening of the scrotum that distinctly signify Tanner Stage II in male development. Understanding these key characteristics is essential for recognizing the stages of puberty and the physical development of males.