Integumentary system

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skin

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Description and Tags

histology

44 Terms

1

skin

largest organ of the body *typically accounting for 15-20 % of total body weight

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2

epidermis, dermis, subcutaneous

3 layers of skin

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3

Epidermis

consist mainly of a stratified squamous keratinizee epithelium composed of cells called keratinocytes

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4

Langerhans cells

Arise from red bone marrow and migrate to the epidermis -Constitute small portion of epidermal cells -Participate in immune responses Easily damaged by UV light

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5

Merkel cells

function as touch receptors in association with sensory nerve endings

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6

Melanocytes

a mature melanin-forming cell, typically in the skin.

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7

Albinism

inability to produce melanin

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8

vitiligo

the complete or partial loss of melanocytes from patches of the skin resulting in irregular white spots

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9

stratum basale, stratum spinosum, stratum granulosum, stratum lucidum, stratum corneum

layers of epidermis

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10

stratum basale

deepest, single layer of cuboidal to low columnar cells, basement membrane

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11

stratum spinosum

normally the thickest layer

limited cell division, langerhans cells

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12

stratum granulosum

3-5 layers of flattened polygonal cells

contains fibers and keratins

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13

stratum lucidum

3-5 layers of clear flat dead cells

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14

stratum corneum

the most superficial layer of the epidermis consisting of dead cells

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15

Dermis

the deep layer of the skin;contains fibroblasts that produces and elastic fibers

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16

papillary layer and reticular layer

two layers of the dermis

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17

Stratum papillarosum/ papillary layer

superficial layer of dermis

composed of areolar connective tissue

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18

stratum reticularosum /reticular layer

deeper layer, dense irregular connective tissue

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19

subcutaneous tissue

known as hypodermis or superficial fasia

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20

areolar connective tissue

contains mast cells that releases histamines and other chemical important in inflammation

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21

adipose tissue

storage for energy, contributes to inflammation by producing cytokenesis that activates wbc

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22

hair

a thread-like keratinized outgrowth from the skin

8-10mm / month

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23

hair follicle, hair bulb, hair root, hair shaft

parts of hair

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24

alopecia

loss of hair

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25

lanugo, angora, definitive

types of hair

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26

Lanugo

fetal hair

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27

Angora

scalp hair or continuous growth hair

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28

Definitive hair

eyebrows

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29

pilomotor or arrector pili muscle

contracts under stress"goosebumps"

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30

hair root plexus

nerve endings sensitive to touch; detect movement of hair

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31

Sebaceous glands (oil glands)

produce sebum that moistens hair

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32

comedo

a plug of sebum in the hair follicle that becomes darkened; commonly called a blackhead

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33

Nails

hard plates of keratin grow 3- 4mm per month

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34

body, nail bed, free edge, nail root, nail matrix, hyponychium, eponycium

parts of nails

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35

nail bed

skin underlying the nail plate

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36

nail root

base of the nail

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37

nail matrix

responsible for nail growth

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38

Hyponychium

attached to free edge to the under surface

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39

Eponychium

covers the nail root

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40

ceruminous glands

dermis of the ear canal

secrete cerumen or wax

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41

Suboriferous glands

sweat glands

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42

apocrine and eccrine

2 types of sweat glands

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43

apocrine

This type of sweat gland is found mainly in the arm pits and groin area, display what type of secretion

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44

eccrine

abundant in forehead, upper lip, palms and soles

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