bsi mod 3 Flashcards
compound vs simple gland
- compound gland: salivary. Simple is sebaceous with 1 duct
dense irregular connective tissue
- mesoderm but some neural crest
- structure, exchange, defense and fat storage
- MUCOSA
strat spinosum
- become spinous cells, larger than basal
- less nc ratio
- no prolif!
- integrin profile changes from a6b4 to a3b1. also keratin profile changes
- no organells, chromatin condense
cytokeratins
made by all epi cells
- int fila
- type 9-20 are type 1 and acidic
- KRT 1-8 are basic
- found in pairs
top layer in skin is called what in oral cavity, skin? characteristics
stratum superficiale is called superficial layer in mucosa and oral cavity, stratum corneum in skin
- this is no organelles, flat and varied width
- water resistant and barrier
hemidesmosome structure
cytokeratin molecules in cytoplasm are connected to integrin a6b4 via bullous pemphigoid 230 and 180 and plectin
- then integrin crosses plasma mem to bind laminin 5 (laminin 332)
desmosome structure
thick part: desmoplakin and plakogoblin
desmoglein and desmocollin are zipper in intercell space
where to find parakeratin
hard palate, dorsum of tongue and attached gingiva
- retained nuc
where to find orthokeratin
in skin!!
melanocytes
- neural crest derived
- live in basal skin and mucosa
- communicate to keratinocytes via dendrites
- melanin does uv rad protection
- cells take up this melanin (umbrella style)
- same number of melanocytes in everyone! pigment depends on number and size of MELANOSOMES, dispersion in skin
- sometimes even on attached gingiva
langerhans cells
- dendritic from bone marrow
- in strat spinosum
- found in all layers of epi and papillary derm
- granulated birbeck stuff thats black
- immune macrophages (1st cells)
merkel cells
- proprioception sensory cells
- from epi progenitor cells
- in basal layer
- from keratinocytes
- fingers, feet, hard palate, lips
- touch stuff. communicate with sensory nerves DIRECTLY
white sponge nevus
mutations in cytokeratin 4 or 13
- white tongue
pachyonychia congenita
mutations in cytokeratin 6,16, or 17
- happens in the accral skin (palms and soles)
- fingernails
- thickened keratin
epidermolysis bullosa (general)
mutations in cytokeratin 5 and 14
- the mitten hand one
- blisters, ulceration
- hereogneous
pemphigus vulgaris
desmoglein 3 is bad
desmosome
- red burning thing
- SUPRABASAL CLEAVAGE IN SPINOUS LAYER!!!
pemphigus foliaceus
desmoglein 1 bad
desmosome
mucous membrane pemphigoid
bp 230 and 180
- mucous problem ONLY
- blindness thing
- antibodies attach proteins that are sub-basilar (under basement mem)
- THIS IS HEMIDESMOSOMES
bullous pemphigoid
bp 230 and 180
- skin problem ONLY
lamina lucida
- made by basal epi
- unique to epi
- anchored by laminin 332 and collagen 17 (bp 180!)
lamina densa
- made by basal epi
- unique to epi
- collagen 4, nidogens nad perlecan
- anchored by collagen 7!!!!
- binds to 4 and laminin 332 above
- binds to collagen 1 and 3 below
“clothespin”
lamina reticularis
- made by fibroblasts
- NO part of basal lamina
- collagen 1 and 3, elastic fibers, fibronectin
epidermolysis bullosa simplex
cytokeratin 5 and 14 or plectin
- separation above basement mem
- all over the body
junctional epidermolysis bullosa
collagen 17, integrin a6b4 or laminin 332
- most severe
- can dev amelogenesis imperfecta, tooth loss and caries
- separation in lamina lucida layer of basement mem