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Images from Peel Region

Bernie Anatomy Model

When a boy begins puberty, many physical changes will occur both externally, that you will be able to see, and internally, that you will not be able to see. Externally, an overall growth spurt happens where the boy’s body grows taller and weight increases. Read about the changes a boy will go through during puberty including changes to his:

  • Face and neck
  • Chest
  • Genitals
  • Legs

Face and neck

Many changes happen to a boy’s face and neck during puberty. The face changes in shape and the jaw line becomes more defined. Rosy cheeks may develop. Pimples may appear anywhere on the face, and sometimes on the back or chest. The boy’s voice will deepen because the voice box increases in size, and the “Adam’s Apple” will appear in the neck. Finally, facial hair will begin to grow.


In a boy’s chest area, you see that the shoulders broaden and the chest grows larger. Underarm hair also begins to grow. Sometime during puberty, chest hair may grow.


In the genital area, the boy’s penis, testicles and scrotum grow larger. Pubic hair grows around the genitals. During puberty, erections begin and wet dreams may occur.

Inside the boy’s body, many physical changes will happen during puberty. Inside the genitals, the reproductive organs increase in size. Inside the testicles, sperm cells begin to be produced.


An overall growth spurt happens during puberty and a boy’s legs grow longer and may become more muscular. You will see that more and thicker leg hair grows as he matures.

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revised May 31, 2012

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Revised: May 31, 2012


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