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Science for Medicine > Skin > Flashcards

Flashcards in Skin Deck (17)
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1
Q

Define skin.

A

The largest organ in the body made of epithelium, connective, muscle and nerve tissues. It has its own nerve and blood supply.

2
Q

Name 6 functions of skin.

A
Epidermis prevents water loss.
Dermis reduces risk of external injury, permits body cooling, maintains the epidermis by blood flow
Immune surveillance
UV protection
Energy storage
Sensory information
3
Q

What are the 2 layers of skin?

A

Epidermis which forms boundaries between internal and external compartments.
Dermis which is made of connective tissue and used for structural strength.

4
Q

What is the hypodermis?

A

It isn’t part of the skin but is anchored to it and made of adipose tissue.

5
Q

What is the epidermis epithelium structure?

A

Stratified squamous epithelium

6
Q

What are the layers of the skin?

A
Stratum corneum
Stratum lucidum
Stratum granulosum
Stratum spinosum
Stratum basale
Dermis
7
Q

Define keratinisation.

A

Organic process of keratin being deposited in the cells.

8
Q

Define the two layers of dermis.

A

Papillary - protective against pathogens, blood vessels for thermoregulation and nerve endings for sense organs

Reticular - collagen bundles in three planes, made of elastic fibres which is often lost in old age

9
Q

How are cells kept waterproof?

A

By keratin filling intracellular spaces with lipid cement.

10
Q

What can skin colour be determined by?

A

Blood, carotene and melanin.

11
Q

Define hair.

A

Thermoregulatory but not in humans. Derived from the epithelial layer.

12
Q

Where do hair follicles come from?

A

Epidermis in utero. Downgrowth of epithelial cells which invade blood vessels causing hair growth.

13
Q

What is the function of the arrector pili muscle.

A

Hair straightens when the muscle contracts.

14
Q

Define sebaceous glands.

A

Found between follicle and pili and secrete sebum.

15
Q

Name 3 types of skin glands.

A

Sebaceous
Apocrine - axilla, protein rich
Eccrine - thermoregulation

16
Q

Define eccrine.

A

Simple tubular glands found in the dermis. They can be coiled or straight and are a spiral channel in epidermis.

17
Q

Name the 4 types of sense organs.

A

Meissner’s Corpuscles
Paceinian Corpuscles
Pain receptors
Thermoreceptors