Knowing the parts of the body in Spanish might be useful if you are traveling around Spain or South America and eventually you need to go to the doctor. In any case, it is a basic thing to learn when learning Spanish, specifically Spanish vocabulary.
Take a look at this exercise to learn all about body parts (partes del cuerpo) in Spanish. Be careful with the gender (masculine or feminine) of some words, like la nariz (nose) or la frente (forehead).
If you need to revise, just take a look at this picture, that you can also download by clicking here.