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BIOL 214

Lab Practical - Integumentary

The skin can be divided into two main components... epidermis and the dermis
What are the five layers of skin? Stratum corneum Stratum lucidum (found only in thick epidermis) Stratum granulosum Stratum spinosum Stratum germinativum (basale)
What layer of skin is only found in the thick epidermis? stratum lucidum
The base layer of the epidermis is called the ____________. stratum germinativum
What layer contains special cells called melanocytes? stratum germinativum
What are melanocytes? they dictate the color of our skin
Melanocytes produce what? melanin
Melanin absorbs what? UV radiation
For those who have low melanocyte activity, skin color is determined by two other factors: Carotene: orange pigment Dermal blood supply: rosy appearance
The epidermis is secured to the what? dermis
These two structures act as a lock in the dermis... epidermal ridges and dermal papillae
Where can epidermal ridges and dermal papillae be found? the fingers and soles of the feet
Excessive friction may cause the two layers to separate, filling the space with interstitial fluid thus creating a __________. blister
Epidermal ridges that extend into the stratum corneum are known as ______________. fingerprints
The dermis lies below the ________. epidermis
The epidermis contains what structures? blood vessels, nerves, sensory receptors, extracellular fibers, hair follicles, and glands
Blood Vessels (arteries and veins) are divided by location, what are the locations? superficial and deep
Nerves interpret information from specialized ______________. sensory receptors
The sensory receptors found in the integumentary system are called ... Meissner’s corpuscles Pacinian corpuscles Merkel cells
Meissner's corpuscles detect what pressure? light pressure
Pacinian corpuscles detect what pressure? heavy pressure (i.e. pacific ocean)
Merkel pressure detects what pressure? soft touch (i.e. Erkel)
What are the two extracellular fibers? collagen and elastin
hair and nails are comprised of what two structures? protein keratin and function to protect integumentary system
Hair is found across the body except for what places? the soles of the feet, palms of the hand, lips, and portions of external genitalia (pubic regions of females, more wide spread on males d/t testosterone production)
What is terminal hair? typically long and thick
Where is terminal hair found? head, eyebrows, eyelashes, and pubic regions
What is vellus hair? typically short and thin, lighter in color
Where is vellus hair found? these hairs comprise most (75%) of the hair on the body on the
What is the Arrector pili muscle? it is the nervous stimulation that lifts the shaft, increasing skin sensitivity
What is the Papilla? it is a vascular structure that provides nutrients
What is the matrix? it is the location of new hair growth
What are the Shaft Layers (superficial to deep)? Cuticle Cortex Medulla
what is the nails function? strengthen the distal portion of digits
What is the function of the Nail Matrix? mitotically active zone of nail growth
What is the lunula? newly formed and undifferentiated white cells of nail body
What is the purpose of the eponychium? epidermal cells dragged forward along the body as the nail grows, otherwise known as the cuticle
What is the hyponychium? epidermal cells dragged beneath the body as the nail grows
Created by: ccporter13