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Lernmaterialien
Where are sebaceous glands NOT found? What do they do?
Sebaceous glands are present throughout the skin, except the palms and soles.
They produce sebum which provides a protective covering for the skin.
How does the dermis support the epidermis?
The dermis supports the epidermis structurally and nutritionally. It provides considerable strength to the skin due to the arrangement of its collagen and elastic fibres.
What is the function of the epidermis?
The epidermis is a physical and chemical barrier between the body and the exterior
What is the function of the dermis?
The dermis provides structural support to the skin
What is deep to the dermis?
Deep to the dermis is a layer of loose connective tissue which is an important deposit of fat called the hypodermis.
How does the thickness of the dermis vary?
Its thickness varies, being thin in the eyelids and thick on the back
What are the two layers of the dermis, which one is more superficial and which layer is thicker?
The dermis is composed of two layers: a thin papillary layer (superficial) and a thicker reticular layer (deep).
What are the four main skin derivatives?
Nails
Sweat Glands
Sebaceous Glands
Hair follicles
What are the two types of sweat glands and where are they found?
Eccrine sweat glands control body temperature and are controlled by the sympathetic nervous system.
Apocrine sweat glands are limited to the
axilla, mammary areola and anogenital region.
What enables good thermoregulation of the skin in warm weather and cooler conditions?
What mediates this?
Good perfusion (flow) in warm weather allows greater heat loss, while blood supply to the skin is reduced via vasoconstriction to preserve body heat in cooler conditions.
This is mediated by arteriovenous anastomoses (connections between small arteries and veins).
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