Yes, they do.
Let me quote Stuart Mc-Roberts best-selling author of ‘Brawn‘, ‘Beyond Brawn‘:
“If you want to add 3 inches on arms, for example, you’ll need to build around 30 to 40 pounds (14 to 18 kg) of muscle over your whole physique. You can’t do that by focussing on your arms.
About two-thirds of your body’s total muscle mass in your thighs, buttocks and back. Your shoulders, chest, abs, arms, forearms and calves made up one-third of your total muscle mass.
Working your thigh-hip-back structure (through squats/deadlifts), yields substantial growth in that large area. But the same movements also produces growth elsewhere.
To build yourself up substantially, focus on big exercises, not detail exercises.”
If you want muscle, read this answer again….