Flashcards in Integumentary System Deck (169)
What is an Arrector pili
A small muscle located parallel to hair follicle. Looks like a string
What is a hair shaft?
The actual tube of hair. All the cells of the shaft are dead
A gland next to a hair follicle that secretes sebum. Looks like a weird face from side veiw
What is a hair root?
The part of the hair that contains both the cuticle, cortex, medulla and the hair matrix, dermal papilla, and melanocytes
The hair bulb contains the dermal papilla, melanocytes and the hair matrix
What is the medulla?
The inner most layer of the hair. Contains air pockets and large cells
What is the cortex
The layer of the hair that is intermediate the medulla and cuticle. Contains melanin, hair color
What is the cuticle?
The outermost layer of the hair. Keratinized
What is the internal root sheath?
It lairs out side the cuticle. In the follicle.
What is the external root sheath?
Lies out side the internal root sheath in the hair follicle. Sometimes called the epithelial root sheath
What is the glassy membrane?
Membrane that lies out side of the external tooth sheath.
What is the peripheral CT?
Also known as the fibrous sheath. It lies outside of the glassy membrane. It's the outer most layer
What is the follicle wall?
Consists of the internal root sheath all the way to the peripheral CT. Parts of the follicle that do not involve the hair itself.
What is the hair matrix?
The area of the hair bulb that produces the hair. On top of the dermal papilla
What is the dermal papilla?
The little nub of dermis that supplies the hair matrix with nutrients.
What is a melanocyte?
A cell found on the lateral sides of the dermal papilla responsible for giving hair color. Looks like moose antlers
Where does the hair follicle start?
Hairs act as..
Sensitive touch receptors
Hairs are called..
The only live part of the hair is.
The epidermis is composed of what layers?
1. Stratum basale
2. Stratum spinosum
3. Stratum granulosum
4. Stratum lucidum (thick skin)
5. Stratum cornea
Where cells are produced
Spiny-cells, keratinization starts here
Flat cells, visible keratin granules. Cells are starting to die
Only found in thick skin. Clear layer
"Horny layer" the outer most layer of scales. Completely dead and keratinized
The skin is composed of..
- the epidermis
- the dermis
What are the layers of the dermis?
1. Reticular layer
2. Papillary layer
Not part of the skin, beneath the dermis, composed of adipose tissue; which anchors the skin, protects from infection and insulates.