Skin

Question 1

Name the five epidermal layers of the skin

Answer 1

Basale
Spinosum
Granulosum
Lucidum
Corneum

Question 2

Give some features of the stratum basale

Answer 2

Contains stem cells for constant proliferation
Bound to basal lamina by hemidesmosomes
Forms papillae with the dermis

Question 3

Features of the stratum spinosum

Answer 3

Preparative layer for keratinisation

Question 4

Features of the stratum granulosum

Answer 4

Contains granules of the precursor to keratin (keratohyalin)

Question 5

Features of the stratum lucidum

Answer 5

converts precursors to keratin

Question 6

Features of the stratum corneum

Answer 6

No organelles
Bound by desmosomes
‘Dead layer’

Question 7

What is psoriasis?

Answer 7

Excess keratin deposition in the skin

Question 8

Name the two dermal layers of the skin

Answer 8

Papillary layer

Reticular layer

Question 9

Features of the papillary layer

Answer 9

Protection against pathogens
Control of thermoregulation
Contains nerve endings

Question 10

Features of the reticular layer

Answer 10

Contains collagen bundles/elastic fibres

Question 11

How are hair follicles formed in utero?

Answer 11

Epithelial downgrowth followed by invasion if a blood vessel knot

Question 12

What is the difference between apocrine and eccrine glands?

Answer 12

Apocrine - where follicles are - empty product before the surface

Eccrine - all over the surface - empty directly on the skin

Question 13

What is the difference between Meissner and Paccinian corpuscles?

Answer 13

Meissner - light touch/fingers

Paccinian - vibration and pressure/pain