Dermis and Hypodermis

dermis

deeper layer of the skin; made of connective tissue; broken into 2 layers

reticular layer

deeper, thicker layer of the dermis

papillary layer

top 4/5 of the dermis

reticular layer 

superficial, thin layer of dermis 

reticular layer

bottom 1/5 of the dermis

dermal papillae

“skin nipples”

dermal papillae 

bumps that bind the epidermis and dermis 

dermal papillae

create fingerprints

meissner’s corpuscle

sense light touch

capillary  loops

where oxygen and nutrients are dropped off in the dermis (shared with the epidermis) 

capillary loops

where CO2 and waste are removed from the dermis

free nerve endings

sense pain, heat, cold, itching, and tickling

hair follicle

tunnel where the hair grows from 

arrector pili muscle

contracts to raise hair on end

sudoriferous gland

sweat glands

pacinian corpuscles

sense heavy touch 

hypodermis

subcutaneous layer

adipose tissue

adheres skin to underlying muscle (anchored loosely enough to allow skin to slide)

adipose tissue 

insulates body heat and absorbs shock 

sensory nerve

sends messages from the merkel cells, meissner’s corpuscles, free nerve endings, and Pacinian corpuscles to the brain

motor nerve

sends messages from the brain to the arrector pili muscles, sebaceous glands, and sudoriferous glands

blood vessels 

delivers blood to and from the skin 

artery

drops off blood with oxygen and nutrients

vein

takes away blood with CO2 and waste

lipids

secreted by lamellar bodies cause skin to be water-resistant and prevent water loss 

acid mantle

our skin’s surface teems with bacteria, so the skin secretes an

slows

an acid mantle __ bacterial growth

sweat and sebum 

have ingredients to kill bacteria 

melanin

acts as a shield over epidermal cells to prevent UV ray damage

langerhans cells

ingest foreign invaders and notify the immune system, calling in other immune cells and triggering an immune response

pulls heat away from the body

as sweat evaporates from our skin, it ____

vitamin D

when exposed to UV rays, our skin helps to produce ___

digestive tract absorb calcium 

Vitamin D helps our ____

hot blood to the surface to release heat

Your blood vessels in your skin dilate and bring ____

deep to trap heat

Your blood vessels in your skin constrict which pulls blood vessels ___