Now, we also have smooth muscle in our dermis and the smooth muscle is found around the roots of the hair follicles and that's because this smooth muscle is responsible for erecting our hair giving us goosebumps. So once again the reticular layer is the lower portion of the dermis it is much thicker than the papillary layer and consists of a highly dense connective tissue made of collagen and elastin fibers these fibers give the skin its strength and elasticity. Now the reticular portion also contains blood vessels, sebaceous glands, sweat glands the root of the hair follicles receptors such as for example pressure receptors as well as smooth muscle. Now finally let's move on to the lowest portion of the skin the hypodermis also known as the subcutaneous layer. Basically this is the layer that insulates our body it contains the adipose cells, our fat cells as shown in the following diagram. So these orange cells are the adipose cells found in the hypodermis.