in this video we're just gonna generally talk about the integumentary system so the integrant Airi system includes your skin hair nails sweat glands as well as sebaceous or oil glands and in terms of just general characteristics of skin itself there's really only two major layers of skin we have the epidermis and the dermis epidermis is the superficial layer of skin it's made of epithelial tissue and therefore is a vascular and that's what we can see when you're looking at skin deep to epidermis we have the dermis and this is the underlying connective tissue that supports the epidermis it's vascular and that sense can help nourish the epidermis and it's also made of mostly a fibrous connective tissue which is gonna give skin a lot of its sort of strength now there's a third layer here that's not technically part of skin but we just talked about as being you know nearby and it's called hypodermis or superficial fascia also called the subcutaneous tissue it's not part of skin but it does share some functions hypodermis is mostly made of adipose tissue as well as some areolar connective tissue now in that sense it's gonna help absorb shock and insulate and because adipose tissue has a lot of adipose sites it's gonna be involved with fat storage now it also helps to anchor skin itself to the underlying structures you know so hypodermis would help link up skin to muscle tissue that's deeper or help link up skin to the bone that's also deeper now in terms of just the general characteristics of skin we can see that in this picture here we have the epidermis which is superficial and the dermis which is deeper the epidermis is made of a stratified squamous carrot keratinized stratified squamous epithelium we also have the dermis which has two major layers we have a papillary layer here which is the superficial 20% of the dermis it's made of a loose areal or connective tissue and that makes sense because it can help nourish the epidermis here and then the dermis is made of the deeper 80% is a reticular layer which is not made of reticular connective tissue don't let this name confuse you instead the reticular layer of the dermis is actually made of a dense irregular connective tissue that's the deeper 80% of dermis remember it's only the epidermis and dermis that make up skin but we talked about the hypodermis as being nearby and it's appropriate to talk about here because we can see it so it's mostly made of adipose in areolar tissue now other things we can see embedded within the dermis include things like your hair erector pili muscle which is involved with goosebumps nerves which are shown here in yellow so these nerve endings are involved with skin sensation so cutaneous sensations we have lots of blood vessels you know about 20% of our body's blood can be stored within skin so it's quite a bit and so the red one here could be an artery and the blue one could be a vein and this one here is showing a sweat gland so it's gonna help with you know thermal regulation and we also have the sebaceous glands associated with hair which secrete oil which is involved with conditioning your skin so just generally remember that the skin has two major layers epidermis and dermis epidermis is the epithelial layer dermis is the connective tissue layer the papillary layer of dermis is superficial 20% remember this is made of areolar connective tissue and the reticular layer which is the deeper 80% is made of a dense irregular connective tissue which is involved with protection