CTB week 2

Question 1

skin purposes

Answer 1

protection from mechanical trauma, bacterial, viral, fungal, prevents dehydration, reg of body temp, innervated=sensory role respect to pain, vitamin D synthesis. epidermis=keratinized stratifies squamous
dermis= connective tissue with blood vessels, glands, nerves, hair roots
deep is subcutaneous connective tissue/hypodermis/superdicial fascia=loose connective tissue

Question 2

epidermis

Answer 2

5 layers-stratum basale, stratum spinosum, stratum granulosum, stratum lucid, stratum corneum

Question 3

stratum basale

Answer 3

most base layer cuboidal/columnar . frequent division to renew skin-clearly metabolically active.presence of ER and golgi. attached to basement membrane by hemidesmosomes. express keratin 5 and 14

Question 4

stratum spinosum

Answer 4

pickle cell layer-cells seem to have thorns. flattened polygonal shape, distinct ovoid nucleus, extensive network of intermediate filaments adhered at desmosomes

Question 5

stratum granulosum

Answer 5

flattened keratinocytes. appear dark from keratohyalin granules. involucrin toughens membrane and adds strength

Question 6

stratum lucidum

Answer 6

(transparent layer) dead cells, nucleus not visible

Question 7

stratum corneum

Answer 7

outermost layer, composed of flat polyhedral plate-like envelopes filled with keratin filaments cross linked with filaggrin=forms cornfield cell envelope

Question 8

Melanocyte

Answer 8

phagocytksed

Question 9

Langerhans Cells

Answer 9

involved in immune response

Question 10

eccrine

Answer 10

sweat gland

Question 11

bulge

Answer 11

stem cell niche for hair follicle

Question 12

fibro

Answer 12

connective tissue

Question 13

chondro

Answer 13

cartilage

Question 14

osteo

Answer 14

bone

Question 15

connective tissue

Answer 15

cells separated by extracellular matrix(structural elements, ground substance

Question 16

loose irregular connective tissue

Answer 16

sparse fibers, abundant ground substance, transient cells