Integumentary system

Question 1

Dermis

Answer 1

Dermis

reticular layer - deeper layer - main layer
cleavage/tension lines - order of elastin collagen fibers

Overstretched - striae/stretch marks ruptured dermis

Papillary layer - (superficial) layer - contains blood vessels
projections called papillae extend toward the epidermis

Question 2

Hypodermis

Answer 2

Hypodermis

loose connective tissue

fibroblasts
adipocytes
macrophages

subcutaneous tissues - not part of the skin - 1/2 the body’s fat - fascia

Question 3

Epidermis

Answer 3

Epidermis

stratified squamous epithelium

separated by basement membrane

less thick, no blood vessels, nourished by diffusion

cells: keratinocytes - keratin ( waterproofing) -
keratinization

      melanocytes - melanin

Question 4

Subcutaneous tissue (hypodermis)

Answer 4

Deep to the skin

Attached to underlying bone and tissue

Supplies the skin with blood vessels and nerves

Consists of loose connective tissue with collagen and elastin fibers

The cells of the epidermis are fibroblasts, adipocytes and macrophages

Question 5

Stratum basale

Answer 5

Deepest layer of the skin- single layer

Keratinocytes mitosis is about every 19 days

One daughter cell- new stratum basale cell; other cells keratinized moves to the top

Question 6

Stratum spinosum

Answer 6

Stratum spinosum

8 to 10 layers
Cells usually shrink from each other (spine) some mitosis occurs here

Question 7

Stratum granulosum

Answer 7

Stratum granulosum

2 to 5 layers with protein granules visible

Question 8

Stratum lucidum

Answer 8

Stratum lucidum

Thin clear zone
cells appear translucent
not present in thin skin

Question 9

Stratum corneum

Answer 9

Stratum corneum

Most superficial layer (.25 layers)
dead squamous cells -discriminate or sloth off cornified cells- keratin and keratohyline

Question 10

Skin color three main causes

Answer 10

Skin color

Pigment
blood
thickness