How many layers is the skin composed of and what are they

What is the epidermis

The thin outer layer of the skin.

What is the skin and its function

The skin is the body's largest organ, covering the entire outside of the body.

The skin's functions is to protect against heat, light, injury,infection, regulates body temperature,stores water, fat, and vitamin D,can sense painful and pleasant stimulation.

How many sub-layers is the epidermis made up of and what are they

The epidermis itself is made up of three sub-layers:

• stratum corneum (horny layer)
  This layer contains continually shedding, dead keratinocytes (the primary cell type of the epidermis). The keratin, a protein formed from the dead cells, protects the skin from harmful substances.
• keratinocytes (squamous cells)
  This layer contains living keratinocytes (squamous cells), which help provide the skin with what it needs to protect the rest of the body.

basal layerThe basal layer is the inner layer of the epidermis, containing basal cells. Basal cells continually divide, forming new keratinocytes and replacing the old ones that are shed from the skin's surface.

The epidermis also contains melanocytes, which are cells that produce melanin (skin pigment).

What is the dermis and what is it made up of

The middle layer of skin The dermis is made up of the following:

• blood vessels
• lymph vessels
• hair follicles
• sweat glands

The dermis is held together by a protein called collagen, made by fibroblasts (skin cells that give the skin its strength and resilience). This layer also contains pain and touch receptors.

What is the fat( Subcutis) layer of skin

The subcutis is the deepest layer of skin and is also known as the subcutaneous layer.