Physiology of the Dermis & Hypodermis

Biology ll

Dermal Papillae

“Skin “nipples”'

Bumps that bind the epidermis and dermis

Create fingerprints

Meissner’s Corpuscle

Sense light touch

Capillary Loops

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

Where CO2 and waste are removed from the dermis

Free Nerve Endings

Sense pain, heat, cold, itching, and tickling

Papillary Layer

Superficial, thin layer of the dermis

Top 1/5 of the dermis

Contains Dermal Papillae, Meissner’s Corpuscles, Capillary Loops, and Free Nerve Endings

Hair Follicle

Tunnel where the hair grows from

Arrector Pili Muscle

Contracts to raise hair on end

Only muscle in the dermis

Sebaceous Gland

Oil glands

Oil is called sebum

Sudoriferous Gland

Sweat gland

Pacinian Corpuscle

Sense heavy touch (pressure & vibration)

Reticular Layer

Deeper, thick layer of the dermis

Bottom 4/5 of dermis

Includes Hair Follicle, Arrector Pili Muscle, Sebaceous Gland, Sudoriferous Gland, and Pacinian Corpuscle

Dermis

Deeper layer of the skin: made of connective tissue: broken into 2 layers (Papillary & Reticular Layer)

Adipose Tissue

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

Insulates heat, absorbs shock

Sensory Nerve

Sends messages from the Merkle Cells, Meissner’s Corpuscles, Free Nerve Endings, & 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

Hypodermis

Subcutaneous Layer

Includes Adipose Tissue, Sensory Nerve, Motor Nerve, and Blood VesselsAnatomy of t

Anatomy of the Dermis and Hypodermis

Hair shaft, Capillary loop, Dermal papillae, Free Nerve Endings, Arrector pili muscle, Sebaceous gland, Hair follicle, Adipose tissue, Motor nerve, Papillary Layer (dermis), Reticular Layer (dermis), Hypodermis, Sudoriferous gland, Blood vessels, Pacinian corpuscle, Sensory nerve