T or F: nerve endings penetrate into the epidermis?
Where are stems cells located for regeneration of the epidermis?
A slough or piece of dead tissue that is cast off from the surface of the skin, particularly after a burn injury
1st degree burn
only superificial layers of the epithelium (cornified and granular layers) are affected: skin is painful, red, swollen, and flakey; usually heal without complication
2nd degree burn (superifical)
Deeper layers of epidermis are affected (granular & spinous layers but minimal basal cell layer involvement; pain and tactile receptors remain: heal with minimal scarring 14-17 days)
2nd degree burn (deep)
All of the epidermis, including basal cell layer is affected; pus forms under the necrotic parched sloughing eschar; there is minimal pain; the only germinal cells remaining are deep within the hair follicles (in the dermis); with care these may heal within 3-4 weeks, usually with extensive scarring, grafts often indicated
3rd degree burn
Loss of epidermis and dermis, wounds often appear white or black with eschar formation and no pain; frequently complicated by wound infection and generalised sepsis; extensive scarring occurs and grafting usually required
4th Degree Burns
All skin and some underlying fascia, muscle ligaments and/or bone affected
What are some consequences of third degree burns?
Hypovolaemia, increased capillary permeability, hypoproteinaemia
Above which portion of the body are burns considered lethal?
Acute systemic consequences of burn injuries (name 2)
Shock and dehydration
What percentage of the koala's body surface is taken up by its trunk (excluding the head)?
A. Basal layer
B. Cornified layer
D. Granular layer
E. Spinous layer