Skin (2) Dermis Flashcards
Name the 2 layers which make the dermis
papillary layer
reticular layer
What characterises the papillary layer of the dermis?
Loose connective tissue
Cellular
What characterises the reticular layer of the dermis?
Dense irregular connective tissue
Fibrous
What layer of the dermis is dense irregular?
reticular
What layer of the dermis is characterised by loose connective tissue?
Papillary
Name layers A and B of the dermis
Does the papillary layer have a regular or irregular interface with epidermis?
irregular
Is the papillary layer of the dermis protective against pathogens?
YES, it is cellular (e.g. macrophages)
What is the purpose of the papillary layer having blood vessels?
Thermoregulation
Nutrition
Does the papillary have nerve endings?
YES, can sense an organ
What layer of the dermis contains collagen bundles?
reticular layer
What can happen to the reticular layer of the dermis in old age?
loss of elasticity
How would you describe the reticular layer of the dermis?
Dense irregular connective tissue
Collagen bundles in three planes
What layer of the dermis have elastic fibres?
reticular
What components make up the hair follicle?
- hair and sheath
- arrector pili muscles
- sebaceous glands
What happens to the hair when the arrector muscles contract?
hair straightens
Where do the arrector pili muscles attach?
follicle
Where are the sebaceous glands located?
between the follicle and arrector pili muscle
What does the sebaceous gland secrete?
sebum
What are the 3 types of skin gland?
sebaceous
apocrine sweat glands
eccrine
What gland does sebum secrete and hair follicle called?
sebaceous
What characterises the apocrine sweat glands?
axilla
protein rich (B.O)
What is produced in the eccrine gland?
sweat
Where are the eccrine sweat glands located?
dermis
Name structure A-C
Describe the morphology of the eccrine sweat glands
simple tubular glands
coiled and straight duct in dermis
spiral channel epidermis
What type of secretion secretes from a eccrine sweat gland?
watery secretion
Are the eccrine sweat glands thermoregulatory?
YES
Name the sensory nerve endings of skin
Meissner’s corpuscles
Paccinian corpuscles
Pain receptors
Thermoreceptors
What is the role of the meissner’s corpuscles?
light touch - fingertips
What is the role of the paccinian corpuscles?
vibration and pressure
What are the stages in skin repair?
Name the layers of the skin A-F
