Anatomy- The Integumentary System Flashcards Preview

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Flashcards in Anatomy- The Integumentary System Deck (18):
1

Hypodermis:

What is it composed of?

Functions?

Subcutaneous layer just deep to the dermis

- mostly adipose with some Areolar connective tissue

- insulates, absorbs, shocks, & anchors skin loosely to muscles.

2

Epidermis

What type of tissue?

Keratinized stratified squamous epithelium

3

Epidermis 4 distinct cell types:

Name and describe

1.Keratinocytes: produce the fibrous protein KERATIN
---tightly connected by desmosomes, waterproofs the
skin.

2. Melanocytes: spider-shaped cells that produce the pigment MELANIN

3. Langerhans' cells(epidermal dendritic cells): macrophages; part of immune system.

4. Merkel Cells: a sensory receptor for touch.

4

Layers of Epidermis: Thick Skin

Has 5 layers(strata), sole of the foot
From least to greatest:
Stratum basale, stratum spinosum, stratum granulosum, stratum lucidum & stratum corneum.

5

Layers of Epidermis: Thin Skin

Has only 4 layers....missing stratum lucidum, stratum corneum thinner

6

Stratum Basale

What does it produce?

Basal layer, deepest epidermal layer firmly attached to dermis.

- single layer of cells; cell division produces new keratinocytes for all layers

7

Dermis

What is it composed of?
What does it contain?

Strong connective tissue

-fibroblasts, , macrophages, mast cells & white blood cells with collagen, elastin & reticular layers.

8

Dermis- papillary layer
-What is it composed of?

Upper layer composed of Areolar connective tissue

9

Dermis- reticular layer
-What is it composed of?

Lower layer(most thickness of the dermis)

Composed of dense irregular tissue.

10

Skin Color ( name 3 pigments)

1.Melanin- Gives color to skin, hair, eyes. Protects cell nucleus from UV light

2.Carotene- yellow-orange pigment. Most evident in thick skin.

3.Hemoglobin- oxygenated hemoglobin in dermal capillaries gives fair skin a pinkish color.

11

2 types of sweat glands

Eccrine and apocrine.

12

Eccrine sweat glands

Far more numerous- most abundant on palms of hands, soles of feet and forehead

Secretes sweat: 99% water with salts, vitamin C

13

Apocrine sweat glands

Ducts empty into hair follicles

Made of sweat, lipid and proteins.

14

Ceremonious Glands

Modified apocrine glands in the external ear canal

-Ear wax

15

Sebaceous(oil)glands

Secret sebum(rich in oils) into hair follicle(or pore), lubricates hair and skin.

16

Hair(pili)

Made of dead keratinized cells.

Melanin produces color in the hair.

17

Hair- alopecia

Hair loss brought by aging and hormones.

18

The skin is composed of 2 regions:

Name and describe them

Epidermis: outermost layer composed of epithelial cells

Dermis: underlying layer composed of fibrous connective tissue