DERMIS AND .pptx

Dermis • Located deep to the epidermis • Composed of a superficial papillary layer & a deep reticular layer • Papillary layer: loose connective tissue • Reticular layer: dense irregular connective tissue (much thicker) • Contains blood vessels, nerves, & sensory receptors • Sensory receptors: free...

Dermis • Located deep to the epidermis • Composed of a superficial papillary layer & a deep reticular layer • Papillary layer: loose connective tissue • Reticular layer: dense irregular connective tissue (much thicker) • Contains blood vessels, nerves, & sensory receptors • Sensory receptors: free nerve endings & Meissner corpuscles • Free nerve endings detect pain, temperature, and itching • Meissner corpuscles are responsible for discriminative touch Dermis continued • Epidermal pegs/ridges: portion of epidermis that projects into dermis • Dermal papilla: portion of dermis that projects into the epidermis • These are significant because they prevent the epidermis from detaching from the Hypodermis • Located deep to the dermis • Transition layer between the skin & underlying muscle • Contains loose connective tissue, adipose tissue, nerves, arteries, veins • Pacinian corpuscles – sensory receptors that respond to vibration