A&P Chapter 5 Flashcards
What is the epidermis?
The superficial region of the skin.
What does the epidermis consist of?
Epithelial tissue, and is avascular
Where is the dermis?
Underlies the epidermis
What does the dermis consist of?
Fibrous connective tissue, and is vascular
What is another name for the hypodermis?
Superficial fascia, SubQ layer
Where is the hypodermis?
Subcutaneous layer deep to the skin
Is the hypodermis part of the skin?
No
What is the hypodermis made of?
Adipose tissue that absorbs shock and insulates
What does the hypodermis do?
Anchors skin to underlying structures: mostly muscles
What tissue does the epidermis consist of?
Mostly keratinized stratified squamous epithelium
What are the four cell types found in the epidermis?
Keratinocytes, Melanocytes, Langerhands/Dendritic cells, and tactile cells
What are keratinocytes?
Cells that produce fibrous keratin, and is the main cell type of the epidermis that is tightly packed
What is keratin?
A protein that gives skin its protective properties
What are melanocytes?
Cells that produce the pigment melanin, which is packaged into melanosomes
Melanosomes are transferred to ______
Keratinocytes, where they protect the nucleus from UV damage
Where are melanocytes found in the skin?
The deepest epidermis
What are tactile cells?
Sensory receptors that sense touch
The epidermis consists of _________ distinct layers
Four or five
Thick skin contains ______
five layers (strata)
Where is thick skin found?
High abrasion areas (hands/feet)
Thin skin contains ____ layers
Four
What are the five layers of skin, deep to superficial?
Stratum Basale –> Stratum spinosum –> Stratum granulosum –> Stratum lucidum –> Stratum corneum
Which layer of skin is only in thick skin?
Stratum Lucidum
What is the stratum basale
Basal layer, which is the deepest of all of the epidermal layers. It is firmly attatched to the dermis