Inegumentary System Test Flashcards
Structures of the integumentary system
- skin
- hair
- nails
- glands
Functions of the integumentary system
- protection
- thermoregulation
- sensory perception
- regulates water loss
- chemical synthesis
4 types of membranes
- serous
- mucous
- synovial
- cutaneous
Serous membranes
Line body cavities
Mucous membranes
Line cavities and tubes that open to the outside
Synovial membrane
Line joints
Cutaneous membrane
Skin
Where is thin skin found
All of the body except palms of hands and soles of feet
Where is thick skin found
Palms of hands and soles of feet
Thin skin doesn’t have stratum ______
Lucidum
Types of cells in the skin
- keratinocytes
- melanocytes
- langerhans cells
- merkel cells
Keratinocytes
Protect and waterproof cells
Melanocytes
Skin color and absorb UV light
Langerhans cells
Participate in immune response
Merkel cells
Give sensation of touch
Layers of the epidermis
- corneum
- lucidum
- granulosum
- spinosum
- basale
Function of stratum corneum
Serves as water, microbe, and injury barrier
Cells is stratum granulosum are
Beginning cell apoptosis (death)
Stratum granulosum function
Secret lipids that act as a water sealant
Stratum spinosum function
Provide strength and flexibility
Stratum basale function
Where new cells are formed
Regions of the dermis
- papillary
* reticular
Cyanotic
Blue skin cause by a depletion of oxygen
Jaundice
Yellow skin caused by liver failure
Erythema
Red skin caused by engorgement of capillaries
Pallor
Paleness
Types of skin pigments
- melanin
- carotene
- hemoglobin
Effect of UV light on skin
- increased melanin production
* prolonged exposure can cause skin cancer
Friction ridges
Markings on fingertips that allow us to manipulate objects more easily
Flexion lines
Lines where skin is flexed, skin is tightly bound to deep fascia here
Freckles
Flat Melanie’s patches caused my genetics or sun exposure
Moles
Elevated patch of melanin
What happens as skin ages (7)
- stem cell activity declines
- reduced immune response
- vitamin D3 production declines
- gland activity decreases
- wrinkles form
- underlying fat disappears
- sagging
Meissners’s corpuscles
Sense light touch
Paccinian corpuscles
Sense pressure and vibration (heavy touch)
What type of skin receptors are the most numerous
Pain
Cold receptors start to perceive cold at
95 F
Hot receptors start to perceive hot sensations at
86 F
Shaft of the hair
Portion above the skins surface
Root of the hair
Portion of hair bellow the skin
3 layers of the hair
- cuticle
- cortex
- medulla
Bulb
Part of hair follicle that contains blood vessels to nourish hair and the pappilla
Hair matrix
Responsible for providing new hair cells
Arrector pili muscle
Pulls hair to make is stand up on end
Root hair plexus
Sense when hair moves
Growth gases of hair
- anagen: growth
- catagen: transition
- telogen: rest
Function of hair
- protect scalp
- eyelashes and eyebrows protect eyes
- nostril and ear hair protect from foreign particles
Hair color is caused by
The amount and type of melanin
Sudoiferous glands
Sweat glands
Eccrine sweat glands
Secretes cooling sweat
Apocrine sweat gland
- stimulated during emotional excitement/stress
* “cold sweat”
Sebaceous glands
Oil glands
Ceruminous glands
Modified sweat glands that produce earwax
Nail body
Portion of nail that is visible
Free edge of nail
Part that extends past the end of the finger
Nail root
Portion buried in the fold of the skin
Lunula
Lighter area of nail
Hyponychium
Secures nail to finger tip
Eponychium
•cuticle
Function of nails
- grasping objects
- manipulating objects
- protects ends of fingers
- scratching
Lesion
Any measurable difference from normal skin structure
Types of lesions
- elevated
- flat
- depressed
Types of infections
- viral
- warts
- fungal
- bacterial
Contact dermatitis
Condition where the skin become red, sore, or inflamed after direct contact with a substance
Types of contact dermatitis
- irritant
* allergic
Psoriasis
Non infectious skin disease in which the stratum corneum thickens as dead cells accumulate
Vitiligo
Autoimmune disorder where melanocytes are destroyed
1st degree burns
•surface layer of skin is shed
2nd degree burns
Blisters form
3rd degree burn
•full thickness of skin is destroyed
4th degree burn
Additional injury to deeper tissue such as muscle and bone
Rule of 9’s
- head, arm: 9% each
- front of torso, back or torso, each leg: 18% each
- groin: 1%
Skin cancer can be caused by
Excessive exposure to Uv radiation, x-rays, radiation, and chemical/physical trauma
Basal cell carcinoma
- Least malignant
* most common 78%
Squamous cell carcinoma
- in stratum spinosum
- 20%
- good chance of recovery if found early
Malignant melanoma
- cancer of melanocytes
- 1%
- deadly