[8] The skin of your forearm is innervated medially via the medial antebrachial cutaneous nerve and laterally by the lateral antebrachial cutaneous nerve (see the graphic down below). These arteries talk to each other in “arches” that kind in the hand. There’s a superficial and deep arch in your hand. https://bsearchblog.com/en/elevate-your-leathercraft-with-our-bag-making-hand-press-and-dies