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Both fingernails and toenails protect the soft tissues of the fingers and toes from injury. Fingernails also serve to enhance sensation and precise movements of the fingertips through the counter-pressure exerted on the pulp of the fingers by the nails. The nail structure is divided into six parts: root, nail bed, nail plate, eponychium, paronychium, and hyponychium. Each of these six components has a specific function, and if a component of the nail structure is disrupted, the nail can look abnormal. The keratin in nails makes them hard but flexible. Nails serve a number of purposes, including protecting the digits, enhancing sensations, and acting like tools. A nail has three main parts: the root, plate, and free margin. Other structures around or under the nail include the nail bed, cuticle, and nail fold.

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The integumentary system includes the epidermis, dermis, hypodermis, associated glands, hair, and nails. In addition to its barrier function, this system performs many intricate functions such as body temperature regulation, cell fluid maintenance, synthesis of Vitamin D, and detection of stimuli.

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The functions of hair include protection, regulation of body temperature, and facilitation of evaporation of perspiration; hairs also act as sense organs. The three inner layers become the hair, made up of the cuticle, the cortex and the medulla – although the medulla isn't always present in hairs with a thinner diameter. The outer three layers become the lining of the follicle and form the inner root sheath and basement membrane, around which lie undifferentiated cells

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The integumentary system also works closely with the circulatory system and the surface capillaries through your body. Capillaries near the surface of the skin open when your body needs to cool off and close when you need to conserve heat. We can't leave out the important sense of touch.

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By helping to synthesize and absorb vitamin D, the integumentary system works with the digestive system to encourage the uptake of calcium from our diet. This substance enters the bloodstream though the capillary networks in the skin

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The skin of the integumentary system helps the immune system because it is the skin that serves as a barrier between the outside world and the internal organs of an organism. ... Once delivered to a lymphatic organ, the antigen is attacked by the immune system.

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Holocrine Glands
Merocrine Glands
Apocrine Glands

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Have ducts that retain a connection to the epithelial surface; secretions reach their target via ducts.

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Hypothalamus
Parathyroid Glands
Thyroid Glands
Gonads
Adrenals
Pituitary Glands

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The endocrine glands secrete hormones directly into the blood stream. There are many different types of endocrine glands.

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Organs in the body that secrete chemicals

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A layer in the dermis. A superficial fascia, subcutaneous layer. Not a part of the skin. Areolar and connective tissue. Has a blood reservoir.

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A layer in the dermis. A dense irregular connective tissue. Pacinian corpuscles- receptor for deep pressure vibration. Cu

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Layer of the dermis. Areolar connective tissue. Meissners corpuscles- receptor for light touch. Sub papillary plexus. Contains lymphatic vessels, sensory neurons.

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These are specialized epidermal cells associated with the nerve endings responsible for detecting light touch and superficial pressure.

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A cell of the epidermis. It is part of the immune system. They send out special agents immediately after sensing any kind of danger in the skin. They capture trespassers such as bacteria and fight of injuries like cuts and scrapes.

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A cell of the epidermis. It contributes to your skin color

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Most of the cells of the epidermis. They produce a protein mixture which makes cells more durable and gives the epidermis its ability to resist abrasion and reduce water loss. Produces Keratin.

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The dermis, beneath the epidermis, contains tough connective tissue, hair follicles, and sweat glands. It is responsible for the structural strength and flexibility of the skin; the epidermis exchanges gases, nutrients, and waste products with blood vessels in the dermis.

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The epidermis, the outermost layer of skin, provides a waterproof barrier and creates our skin tone. Prevents water loss and the entry of chemicals and microorganisms. Protects against abrasion and ultraviolet light
produces vitamin D. It gives rise to hair, nails, and glands.