Intro to Anatomy Flashcards
How often does the epidermis renew? a) 30 days b 28 days c) 14 days d) 35 days
b) 28 days
List the 5 layers of the epidermis
- stratum corneum
- stratum lucidum
- stratum granulosum
- stratum spinosum
- stratum basale
What are the 4 cell types of the epidermis
- keratinocytes
- Melanocytes
- Langerhans
- Merkel cells
Feature of the stratum corneum
semi-permeable barrier
“bricks” = stacked corneocytes
“Mortar” (lipid substances) = ceramides, cholesterol, fatty acids
NOT IN MUCOSAL TISSUE
Where is the stratum lucidum present?
palms and soles (thick skin)
which layer of the epidermis produces corneocytes, lipids and proteins?
stratum granulosum
NOT IN MUCOSAL TISSUE
What do keratinocytes produce?
epidermis, produce keratin
What do melanocytes produce?
melanin
What is the function of langerhans cells?
From bone marrow and function as antigen presenting cells
Function of merkel cells?
slow adapting touch receptors
What are the 2 layers of the dermis?
papillary dermis (superficial) = loose connective tissue reticular dermis (deeper) = dense connective tissue
What do fibroblasts produce?
collagen, elastin and ground substance
examples of Adnexa (skin appendages)
hair follicles, sebaceous and apocrine glands, eccrine glands
Function of eccrine glands
release sweat = temperature control
all over body
What are apocrine glands responsible for
body odour
