Chapter 5 Flashcards
What tissue is epidermis made of
Keratinized stratified squamous
Cells in epidermis
Keratinocytes
Melanocytes
Intraepidermal macrophages
Tactile epithelial cells
Keratinocytes
Produce keratin/lamellar granules (releases water repellent sealant desires water entry/loss foreign particle entry)
Melanocytes
Produce melanin
Form veil over keratinocytes nucleus to protect from UV
Intraepidermal Macrophages/langerhen cells
Help immune system recognize/destroy invading microbes
Tactile epithelial cells (Merkel cells)
Contact tactile/merkel discs detect touch sensations
Thin skin layer
Basum, spinosum, granulosum, thin corneum
Thick skin layers
Basum, spinsosum, granulosom, lucidum, thick corneum
Stratum basale
Deepest layer, single row cuboidal/columnar keratinocytes, stem cells, tactile discs/cells
Stratum spinosum
8-10 layers of keratinocytes Desosomes keratin intermediate filaments, Intraepidermal macrophages, melanocytes
Stratum granulosum
Keratinocytes undergo apoptosis
Keratohylin
Lamellar granules
Stratum lucidum
Thick skin 4-6 layers dead keratinocytes
Stratum corneum
Few to 50 (25-30) layers desd keratinocytes
No nuclei/organelles
What tissue is dermis made of
Dense irregular connective tissue
Regions of dermis
Papillary
Reticular
Papillary
1/5
Collagen/fine elastic fibers
Dermal papillae increase SA
Free nerve vending
Dendrites lacking structural specialization
Reticular region
4/5 thickness
Thick collagen/elastic fibers scattered fibroblast wandering called
Collagen Fibers arranges netlike=resist stretching
BV, nerves, hair follicles sebaceous sudoriferous
Basis for skin colour
Melanin
Hemoglobin
Carotene
Hair shaft
Superficial portion
Hair root
Deep portion penetrates dermis sometimes subcutaneous
Medulla cortex cuticle
Medulla
Inner portion
Pigment cells
Cortex
Middle portion
Elongated cells
Cuticle of hair
Outermost later
Heavily Keratinized