Unit 4: Ch 6 (Integumentary System) Flashcards
1
Q
Accessory structures
A
- Only found in thin skin
- Hair & nails
- Cutaneous glands
2
Q
Alopecia
A
- Thinning of hair/baldness
- Worsened by disease, poor nutrition, fever, emotional stress, radiation, chemotherapy
3
Q
Anatomical differences between dermis and epidermis
A
-
Epidermis
- avascular
- keratin
-
Dermis
- vascular
- contains blood vessels, glands, and nerve endings
- contains hair follicles & nail roots
4
Q
Blister
A
- Damaged dermal blood vessel (ie burn, friction)
- Results in serous fluid seeping out of vessel and accumulating
- Separates the epidermis from the dermis until the fluid is either reabsorbed or expelled by rupture
5
Q
Colors of diagnostic value
A
-
Cyanosis (blue)
- Blueness of skin resulting from a deficiency of oxygen in the circulating blood
- Examples: Lung disease, cardiac arrest, slow blood flow, airway obstruction
-
Erythema (red)
- Redness of the skin caused by increased blood flow in dilated cutaneous blood vessels or by dermal pooling of red blood cells
- Examples: exercise, hot weather, sunburn, anger
-
Albinism (white)
- Lack of pigmentation that alters the integumentary system
- Effected people have inherited a recessive, nonfunctional tyrosinase allele from both parents
-
Jaundice (yellow)
- Yellowing of the skin and whites of the eyes resulting from high levels of bilirubin in the blood
-
Hematoma/bruise (multiple)
- A mass of clotted blood showing through the skin
- Can be a variety of colors depending on how much healing has occurred
6
Q
Cutaneous glands
A
-
Sudoriferous (sweat) glands
- Merocrine (eccrine): at birth
- Myoepithelial cells
- Sensible (see/feel sweat) v. insensible (unable to see/feel sweat)
- Apocrine: post-puberty
- Bromhidrosis: body odor
- Pheromones
- Merocrine (eccrine): at birth
- Sebaceous: oil gland next to hair follicle
- Ceruminous: ear wax
- Mammary: produces milk
7
Q
Cutaneous membrane
A
- The skin
- 2 regions
-
Epidermis
- Keratinized stratified squamous epithelium
- Surface consists of dead cells packed with keratin
- Avascular; dependent on diffusion
- Arises from the ectoderm
-
Dermis
- Fibrous connective tissue: collagen, elastic, & reticular fibers, fibroblasts
- Vascular
- Arises from the mesoderm
-
Epidermis
- The hypodermis is NOT a part of the cutaneous membrane
8
Q
![](https://s3.amazonaws.com/brainscape-prod/system/cm/341/048/240/q_image_thumb.png?1617036086)
A
![](https://s3.amazonaws.com/brainscape-prod/system/cm/341/048/240/a_image_thumb.png?1617036098)
9
Q
Dendritic/Langerhans cells
A
- Found in stratum spinosum & stratum granulosum
- Provide immunity
10
Q
Dermal papilla
A
- Provides the hair with its sole source of nutrition
11
Q
Dermis layers
A
-
Papillary layer (superficial)
- Areolar connective tissue
- Rich in small blood vessels
- Allows for the mobility of leukocytes and other defenses
- Superficial 1/5 of dermis
- Often extends upward as dermal papillae
-
Reticular layer (deep)
- Dense irregular connective tissue
- Collagen fibers in all planes. Stretching of skin can tear the collagen fibers and produce striae (stretch marks)
- Deeper 4/5 of the dermis
12
Q
Epidermis stratification
- Cell classification
- Layers
- Cells present
A
- Keratinized stratified squamous epithelium
- Layers
- Stratum corneum
- Stratum lucidum (only in thick skin)
- Stratum granulosum
- Stratum spinosum
- Stratum basale
- Cells
- Stem cells
- Keratinocytes
- Melanocytes
- Tactile/Merkel cells
- Dendritic/Langerhans cells
13
Q
![](https://s3.amazonaws.com/brainscape-prod/system/cm/341/048/533/q_image_thumb.png?1617036274)
A
![](https://s3.amazonaws.com/brainscape-prod/system/cm/341/048/533/a_image_thumb.png?1617036284)
14
Q
Flexion lines (flexion creases)
A
- Lines on the flexor surfaces of the digits, palms, wrists, elbows, etc
- The skin is tightly bound to deeper connective tissues along these lines
15
Q
Fontalis muscles
A
Muscles for eyebrow expressiveness
16
Q
Friction ridges
A
- Produce fingerprints
- Enhance fingertip sensitivity to texture by vibrating and stimulating sense organs called lamellar corpuscles
- Form during fetal development and remain unchanged for life
- Patterns result from a combination of heredity and the surfaces that the fetus randomly touches with its fingertips before birth
17
Q
![](https://s3.amazonaws.com/brainscape-prod/system/cm/344/470/674/q_image_thumb.png?1619788812)
A
![](https://s3.amazonaws.com/brainscape-prod/system/cm/344/470/674/a_image_thumb.png?1619788828)
18
Q
Hair cycle
A
-
Anagen
- growth stage
- 6-8 years
-
Catagen
- mitosis ceases
- the follicle shrinks and the hair dies and loses its anchorage
- Hair becomes a club hair (easily pulled out while brushing)
- 2-3 weeks
-
Telogen
- hair follicle rests
- 1-3 months
19
Q
Hair follicle structure
A
- Hair follicle contains the hair root
- 2 layers
-
Epithelial root sheath
- Extension of the epidermis
- Stratified squamous epithelium
- Widens to form a bulge, a source of stem cells for follicle growth
-
Connective tissue root sheath
- Derived from the dermis
- Collagenous connective tissue
- Surrounds the epithelial sheath
-
Epithelial root sheath
20
Q
Hair functions
A
- Barrier (Antimicrobial properties & water retention)
- Hair receptors (feel sensations)
- UV protection (pigmentation)
- Thermoregulation (arrector pili)
- Mate attraction (apocrine glands)