Skin Upper dermis f⑥Endothelium 5μ discontinuous 15μ smooth muscle 40-604 Endothelium Smooth muscle single layer 50r 50μ Mid-dermis Thick endothelium Collagen Few layers of loose elastic tissue 00-400μ smooth muscle Endothelium Deep dermis with ill defined elostic Internal elastic lomina Smooth muscle Artery several layers Vein Diagram of most frequent vascular pattern and structure in adult human skin.Diagram of most frequent vascular pattern and structure in adult human skin. Skin