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Glossary of Human Anatomy Lab 7

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Dermis
Deeper than the epidermis. It is directly under the top layer of your skin.
Epidermis
Located on the surface (It's the part of your skin that shows)
Hypodermis
Not a layer of the integument, but it layers the integument to the underlying bone or muscle.
Sebaceous Glands
Oil glands
Sudoriferous Glands
Sweat glands
Sweat Ducts
Connect suderiferous glands to the surface of the skin.
Stratified Squamos Epithelium
Epidermis is composed of this, with the superficial layer infused with the protein karatin.
Keratin
A tough, water-resistant material that also serves to protect lower layers of the epidermis from ultraviolet radiation.
Strata
Layers in the epidermis.
Stratum Basale
The deepest layer of the epidermis in thick skin. This single layer of cells is adhered to the dermis by the basement membrane.
Basement membrane
A noncellular layer.
Melanocytes
Produce melanin.
Melanin.
Protects the stratum basale from the damaging effects of ultraviolet radiation.
Stratum Spinosum
The layer of numerous cells superficial to the stratum basale.
Desmosomes
Cells join at these microscopic junctions.
Stratum Granulosum
A layer of granular cells. These cells have purple-staining granules in their cytoplasm.
Stratum Lucidum
This is only found on the palms of the hand and the soles of the feet.
Stratum Corneum
The most superficial layer of the skin. A tough layer consisting of dead cells flattened at the surface.
Keratinized Stratified Squamos Epithelium
The dermis is made out of this.
Blood Vessles
Pass into the dermis, bringing nutrients to both the dermis and the epidermis.
Light Touch Corpuscles
Sensory is received here, among other places.
Papillary Layer
The dermis consists of two major regions- this being the most superficial one.
Reticular Layer
The dermis consists of two major regions- this being the deeper one.
Papillae
Bumps on the papillary layer that interdigitate with the epidermis, providing good adhesion between the two layers.
Meissner's Corpuscles
A light touch corpuscle that is located in the upper portion of the dermis.
Merkel Discs
A light touch corpuscle that is located in the upper portion of the dermis and the lower portion of the epidermis.
Pacinian Corpuscles
These sense pressure.
Warm Receptors
This fires up when you are comfortably warm.
Cool Receptors
This fires up when you are comfortably cool.
Pain Receptors
These fire up when you go beyond the cold and hot points that are comfortable. These are naked nerve endings that respond to numerous environmental stimuli.
Lactiferous Glands
Milk glands
Ceruminous Glands
Earwax glands
Eccrine Glands
A type of sweat gland that is sensitive to temperature and produces normal body perspiration.
Evapoative Cooling
A mechanism using perspiration in order to cool the body.
Apocrine Glands
Secrete water and a higher concentration of organic acids than eccrine glands.
Sebum
An oily material secreted by sebaceous glands, which lubricates the hair and decreases the wetting action of water on the skin.
Hair
An accessory structure of the integumentary system and consists of keratinized cells produced in hair follicles.
Hair Follicles
Enclose the hair.
Shaft
The part of the hair that erupts from the skin's surface.
Root
The part of the hair that is enclosed by the follicle.
Hair Bulb
The actively growing portion of the hair.
Determinate Hair
Grows to a specific length and stops (groin, eyelashes, brows)
Indeterminate Hair
Continues to grow without regard to length.
Dermal Papilla
At the center of the bulb, this is a region with blood vessels blood vessels and nerves that reach the hair bulb.
Root Sheath
Composed of an outer dermal layer of connective tissue and an inner epithelial layer.
Arrector Pili
When these contract, your hair "stands on end".
Medulla
The central portion of the hair, enclosed by the outer cortex.
Cortex
Encloses the medulla. This may contain a number of pigments, which give the hair its color.
Cuticle
This is the layer superficial to the cortex and looks rough in microscopic sections.
Nail Body
The big, fatty, flesh-colored part of your nail.
Free Edge
The part of the nail you clip (white)
Eponychium
The cuticle of the nail.
Nail Root
Underneath the eponychium and is the area that generates the nail body.
Nail Bed
The layer deep to the nail body.
Lunula
The small white crescent that occurs at the base of the nail.
Hyponychium
The region under the free edge of the nail.
Nail Groove
A depression between the body of the nail and the skin of the fingers.
Nail Fold
The ridge above the nail groove.

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