Skin 2

Question 1

What are the 3 main types of skin cancer?

Answer 1

• Basal cell carcinoma
• Malignant Melanoma
• Squamous cell carcinoma

Question 2

How do epidermal appendages form?

Answer 2

Down growths of epidermis into dermis

Question 3

Where do blisters form?

Answer 3

Between epidermis & dermis

Question 4

What forms a dermal plexus?

Answer 4

Branches of cutaneous nerves at the base of the dermis

Question 5

What forms free nerve ends/encapsulated nerve endings

Answer 5

Individual branches from dermal nerve plexus that move into higher skin

Question 6

Where are merkel cell-neurites found?

Answer 6

• Afferent nerve fibres
• Temp, pain, touch
• -Free nerve endings- Dermal epidermal junction
• Merkel cells specifically in basal layer of epidermis

Question 7

Where are pacinian corpuscles found?

Answer 7

• large encapsulated
• Respond to touch, pressure, vibration & tension
• Dermis/ deep layers of skin, ligs, joint capsule

Question 8

Where are Meissners Corpuscles found?

Answer 8

• Small encapsulated
• Tip of dermal papillae esp. fingertips, eyelids, lips,nipples
• Light discriminative touch

Question 9

Where are Ruffini endings found?

Answer 9

• soles of feet
• Spindle shaped
• Dermis

Question 10

Where is the vasculature of the skin found and what is the function of the vascular supply?

Answer 10

• Dermis
• Thermoregulation
• Metabolic support of avascular epidermis

Question 11

What appendages can be found in the skin? Describe them

Answer 11

• Hair follicles= keratinised structures, ensheathed in collagen, dermal papilla at base, arrector pili s. muscle attached to follicular sheath
• Sebaceous glands= Associated with each hair follicle, secrete oily sebum onto hair surface, acting as waterproofing & moisturising agent, found independently in other places
• Sweat glands= simple, coiled tubular glands, secrete a watery fluid onto skin, important in thermoregulation, apocrine sweat glands in genital/axilla area

Question 12

What are dermal papilla and their functions?

Answer 12

• Help adhesion between dermis & epidermis

- Provide large SA to nourish epidermal layer

Question 13

Describe the reticular and papillary dermis

Answer 13

R= layer of dense irregular connective tissue, contains collagen bundles woven into a coarse network, contains fibroblasts, macrophages, fat cells & elastin
P= Upper layer, loose connective tissue, contains Meissners corpuscles & free nerve endings