Earlobes. The rest of the ear is important because it funnels sound waves into the ear but I read somewhere that you could hear just fine without earlobes and if humans continue to evolve, then they won't have earlobes because they serve no purpose. Just as a side note.... I don't think the male nipples have a true function either!!
A body part that is not used, such as the vermiform appendix, is called a vestigial organ.
Elbow
neck
That depends on the body part, please be more specific. State which body part you want the scientific name for and I'm sure someone will oblige you. -Dragonheart91 upper arm
Temple.
veins
nail
Its proboscis.
PALLET
Abduction
The part of a rat's body that is used to regulate their body temperature is the brain stem.
A horse testicle is a part of the horse where it is used for breeding to produce foals. The testicle is also a name for a part of a human body.
Elbow
eyes
neck
what is the common name for the part of your skeleton that supports your body when you sit upright
River mouth and your mouth, Isn't it?
The letters 'leukkcn' can be rearranged to spell the body part knuckle.