Unit 1 Master Review

Merkel cell found where?

Basal layer

Meissner’s corpuscles found where?

dermal papillae

Ruffini corpuscle found where?

Deep in dermis, subcutaneous tissue

Pacinian Corpuscle found where?

Reticular dermis, subcutaneous hypodermis, densely packed in hands and feet

Merkel cells detects what?

prolonged light touch, texture, fine points

Meissner corpuscles detect what?

light touch, textural changes, vibration

Ruffini corpuscles detect what?

skin stretching, limb position

Pacinian corpuscles detect what?

Vibration and pressure

Mechanoreceptors include

merkel cell, meissner’s corpuscles, ruffini corpuscles, Pacinian corpuscles

Free nerve endings found where?

epidermis, dermis, around hair

Free nerve endings detect what?

mechanical stimuli, painful and thermal stimuli

Nocrireceptor found where?

Epidermis and dermis, muscles, joints, internal organs

Nocrireceptors detect what?

painful stimuli

merkel cell adapting speed

slow

merkel cell receptive field

small

Meissner’s corpuscles adapting speed

fast

Meissner’s corpuscles receptive field size

small

Ruffini’s corpuscles adapting speed

slow

Ruffini’s corpuscles receptive field size

large

Pacinian Corpuscle adapting speed

fast

Pacinian corpuscles receptive field size

large

Thermoreceptor adapting speed

slow

Thermoreceptor receptive field size

small

Nocrireceptor adapting speed

slow

Nocrireceptor receptive field size

both

Slow adapting

fires impulses continuously for as long as a constant stimulus remains

Fast adapting

Fire an initial burst of signals, quickly drops when continues

main function of epidermis

form protective barrier and replace old cells

main function of keratin

form a tough, protective outer barrier

desmosomes function, where’s it found?

attach adjacent cells to one another, found in stratum spinosum

what layer do keratinocytes lose their nuclei?

stratum granulosum

apoptosis occurs where?

stratum granulosum

stratum granulosum generates large amounts of what

keratin and keratohyalin (both proteins)

lamellar bodies do what

hold and release glycolopids to create waterproof barrier

where is the stratum lucidum

palm, soles, digits

stratum lucidum contains what

eleiden, a clear protein that gives the layer its translucent, shiny look

Top layer of dermis is called and made of what

papillary layer, loose, areolar connective tissue

what forms a mesh in papillary layer

collagen and elastin fibers

Bottom layer of dermis is called and made of what

Reticular layer, much thicker, dense irregular connective tissue

Elastin fibers enable

movement

Collagen fibers provide

structure, binds/hydrates skin