Ch.3 Physiology & Histology Of The Skin (3 Layers Of The Skin)

Question 1

Describe Subcutaneous Layer:

Answer 1

Aka hypodermics, superficial fascia
•composed of subcutis tissue aka Adipose tissue (fat)
•connective tissue that cushions, provide energy and contours body
•80% fat
•thins with age
•thick layer May mean hormonal disbalance

Question 2

Describe DERMIS layer:

Answer 2

•aka derma, corium cutis, true skin
•support layer of connective tissue above the hypodermics (subcutaneous)
•25x thicker than epidermis
•2 layers reticular (below) papillary (above)
•supplies skin with oxygen & nutrients

Question 3

Describe the two layers in Dermis:

Answer 3

•Reticular- bottom layer made of elastins & collagen that when damaged cause sagging, aging, wrinkles, stretch marks
• elastin & collagen are broken down by : smoking, UV, environment

•Papillary- top layer connects dermis to epidermis
•makes up 10-20% of Dermis
•dermal papillae ridges attached to epidermis (capillaries nourish tactile corpuscles which are sensory receptors)
• papillae attached to hair is hair papillae
•collagen & elastin more loose and widely spread here

Question 4

What is collagen?

Answer 4

•Protein that strengthens skin and necessary for healing
•produced by fibroblast (produce proteins and aid in production of collagen & elastin)
•makes up 70% of dermis
•

Question 5

What is elastin?

Answer 5

•fibrous protein that forms elastic tissue and gives skin elasticity
•1/15th amount

Question 6

What is glycosaminoglycans?

Answer 6

Large protein molecules& water binding substances

Work to support & maintain elastin & collagen and retain moisture

Hyaluronic acid -hydrating fluid