Integumentry Ch 5 Flashcards Preview

A&P 241 > Integumentry Ch 5 > Flashcards

Flashcards in Integumentry Ch 5 Deck (24):
1

Epidermis

Keratinized stratified squamous epithilium with 4 cell types and 5 layers
(4 in thin skin)

2

4 cell types

Keratinocytes
Melanocytes
Dendrintic ( Langerhans cells)
Tactile (Merkel cells)

3

Keratinocytes

Produce keratin that gives epidermis its protective property. Most abundant epithelial cells.

4

Melanocytes

Spider shaped, synthesize pigment melanin.

5

Dendritic Cells

Langerhans cells, arise from bone marrow and migrate to epidermis. Ingest foreign substances and are key in immune defense.

6

Merkel Cell

Tactile, present at epidermal/dermal junction

7

Layers of the epidermis

Statum:
Basal
Spinosum (prickly layer)
Granulosum
Lucidium (clear layer)
Cornuem (horny layer)

8

Layers of the Dermis

2nd major skin region
Papillary layer:Areolar connective tissue
Reticular layer:Dense fibrous connective tissue

9

Cleave tension lines

separations or less dense regions

10

Flexure lines

Skin markings, dermal folds that occur near joints

11

Skin color pigments:

Melanin, Carotene and Hemoglobin.

12

Hair

Hard kerotinized cells, do not flake off, strong and durable.

13

3 concentric layers of hair

Medulla: central core, soft keratin (matrix below produces hair)
Cortex: bulky, hard, layer surrounding the medulla
Cuticle : outermost

14

2 types of hair

Vellua: pale, fine, body hair
Terminal:coarse long hair of eyebrows and scalp

15

2 types of glands

Sebaceous (Oil)
Sudoriferous (Sweat Glands)

16

Sudoriferous - Sweat Glands

Merocrine: secrete sweat
Apocrine: secrete sweat + protein

17

Apocrine glands

Secrete products in hair follicles
Axilla, nipples, pubic region
Begin at puberty
Controlled by nervous system and hormones

18

Sebaceous gland

Secrete oil called sebum, kills bacteria on skin, lubricates and protects keratin, and conditions skin.

Sebaceous follicles are not associated with hair follicles, discharge onto the epidermis.

19

Protection

Chemical barriers: Acid mantle
Physical barriers:
Biological barries: dendritic cells, macrophages and DNA

20

Skin CA

Basal cell: most common least malignant
Squamous cell: 2nd most common, affects keratinocytes
Melanoma: least common most dangerous

20

Accessory structures of the integument:

hair follicles
nails
sweat glands
sebaceous glands

21

The portion of the hair follicles where cell division occurs s the

Matrix

22

Regeneration of injured skin:

1) Inflammation: bleeding and regeneration
2) Migratory phase: scab and granulation tissue formation
3) Proliferation phase: loss of granulation and undermining of the scab
4) Scarring phase

23

Skin Cancer
A
B
C
D

Asymmetry
Border
Color
Diameter