Skin and Mucous Membranes

Question 1

what are the three layers of the skin

Answer 1

epidermis
dermis
subcutaneous layer

Question 2

what are the 5 layers of the epidermis

Answer 2

stratum basale - basal layer where cell division occurs
stratum spinosum - spiny appearance due to appearance of desmosomes
stratum granulosum - grainy appearance
stratum lucidum - only in thick skin (heels and palms)
stratum corneum - dry , dead layer of keratin

Question 3

What 4 cells are found within the epidermis

Answer 3

melanocytes - produce melanin
Merkel cells - sensory receptors, give brain reception of touch
langerhans cells - APCS
keratinocytes - majority, form keratin

Question 4

what are the 2 layers of the dermis

Answer 4

papillary layer - directly below epidermis , projects into stratum basal
reticular layer - contains glands

Question 5

mucous membranes

Answer 5

specialised epithelial lining that produce a lubricate fluid
found anywhere with opening to external environment e.g mouth, respiratory tract

Question 6

what does the lubricating fluid produced by mucous membranes contain and why

Answer 6

mucin to trap microbes and dirt particles

Question 7

what are the two layers of mucous membranes

Answer 7

epithelium and lamina propria which are separated by a basement membrane

Question 8

rete ridges

Answer 8

epithelium projections into underlying connective tissues in both skin and mucous membranes