Body: torso and limbs (plecy, kolano)

From the neck down

neck

szyja neck, throat

gardło throat (the inside — what hurts when you are ill), arm, shoulder

ramię arm / shoulder, belly, stomach

brzuch belly, stomach, back (plural noun)

plecy back (always plural), knee

kolano knee.

What it is all made of

skin; leather

skóra skin — also leather, bone

kość bone (a feminine -ość-style noun: pl. kości).

Plecy behaves like włosy and lody: Plecy mnie bolą — my back aches, with a plural verb.