Skin
List the 2 principle layers of the skin
What is ?
epidermis and dermis
Type of cells in the basal layer
What is ?
Columnar or cubodial
Where are collagen fibers, elastic Fibers, and fibroblast found
what is ?
reticular layer of dermis
What process occurs in the basale layer of stem cells that all was the cell replacement for those lost superficially
what is ?
Mitosis
What color band is the S. Lucidum?
What is?
clear
1. Skin graph from one are of patient to another area?
2. Skin graph from a twin?
What is ?
1. Autograph
2. Isograph
What accessory structure are found in the dermis
What is?
hair follicles, glands, bvs, nerves
True or false the epidermis is avascular
true the epidermis is avascular
The S. Granulosum has ___ rows of cells
what is
3-5 rows
tissue found in dermis
What is?
Denese irregular CT
The difference between albinism and vitiligo
Albinism is the genetic LACK of melanin whole vitiligo is DECREASED melanocytes in areas
Redness of skin
what is?
Erythema
The Spinosum contains several layers of ____ which are large, flattened, bound by desmosomes
What is ?
Keratinocytes
name the cell found in the basale layer that
1. produces pigment
2. Involved in sensory perception
What is?
1. Melanocytes
2. Merkel cells
Describe the cells found in S. Corneum
What is?
fused and flattened dead cells filled with keratin
Explain Apoptosis and which layer it begins.
What is?
Cell death because too far from vascular supply for diffusion of nutrients
The dermis develops from_____
What is?
embryonic mesoderm
Chronic skin disorder, division of keratinocytes
Psoriasis
What is a Keratinocyte ?
Most common cell type of epidermis; producing keratin proteins
separates the basale layer from the dermis
What is ?
Basement Membrane
which layer of skin
- subcutaneous tissue
- attaches skin to underlying structure
- loose CT
- adipose CT
What is?
Hypodermis
Yellowish pigment
Carotene
List and explain the 6 parts of hair.
what is ?
Root: bottom end below skin surface
bulb: enlarged terminal end of root
shaft: portion above the skin surface
medulla: central core, contains pigment granules
cortex: keratinized cells surrouded by medulla
cuticle: hard keratinzed cells outside of cortex
Skin appears blue
Cyanotic
List the layers in thick skin from order of most superficial to deepest
What is?
1.stratum corneum (most superficial)
2. Stratum lucidum
3. Stratum granulosum
4. Stratum spinosum
5. Stratum basale (deepest)
Name this layer …
- most superficial layer of the dermis which fits closely against the epidermis
- many ”dermal papillae”
- contains capillary loops and receptors for temp and pressure
What is ?
Papillary layer
The S. Lucidum is only seen?
What is?
thick skin
Explain the location and layers of thick and thin epidermis skin
What is?
thin skin is located over most of the body and contains 4 layers
thick skin is located on soles of feet and palms, containing 5 layers
1. Inflammatory: vasodilation, increased vascular permeability, increased WBC’s
2. Migratory phase:scab granulation tissue
3. Proliferate phase: scar tissue formed (fibrosis)
4. Maturation phase: resurfaced epithelium
Yellow build up
What is ?
Jaundice