The neck is the Cervicis.
Hope this helps
I think its the immune system <span>¯\_(ツ)_/¯</span>
It is because of the different neurotransmitters and their receptors.
Sympathetic stimulation of arterioles in skeletal muscle is mediated by epinephrine acting on its β-adrenergic receptors.
Sympathetic stimulation of vasoconstriction occurs as a result of activation of α-1 adrenergic receptors by norepinephrine released by post-ganglionic sympathetic neurons.
The type is off in a couple of places with half of the lines shifted over one space, so it makes it hard to read. Check the pic.