Transcript tactile corpuscle

Integumentary Lab
Biol 2401
Exteroreceptors of Integumentary
System
• Merkel cell
– exteroreceptor for light or discriminative touch
• tactile corpuscle = Meisner's corpuscle
– exteroreceptor for light or discriminative touch
• lamellated corpuscle = Pacinian corpuscle
– exteroreceptor for vibration
• root hair plexus
– exteroreceptor for fine touch detecting external
movements of the hair shaft
Yellow Nail Syndrome
• Yellow discoloration in your fingernails may result from a
respiratory condition, such as chronic bronchitis, or from
swelling of your hands (lymphedema).
• In yellow nail syndrome, nails thicken and new growth slows,
resulting in discoloration.
• Nails affected with this condition may lack a cuticle and may
detach from the nail bed in places.
• Yellow nails may also result from any condition that causes the
growth of your nails to slow down.
Nail Clubbing
• Clubbing occurs when the tips of your
fingers enlarge and your nails curve around
your fingertips.
• This condition results from low oxygen
levels in your blood and could be a sign of
lung disease.
• Clubbing is also associated with
inflammatory bowel disease and liver
disease.
Spoon Nails (Concave)
• Spoon nails (koilonychia) are soft nails
that look scooped out.
• The depression usually is large enough to
hold a drop of liquid.
• Spoon nails may be a sign of iron
deficiency anemia.
Terry’s Nails
• Nails look opaque, but the tip has a dark band.
• Sometimes this can be attributed to aging. In other
cases, it can be a sign of serious illness, such as:
• Congestive heart failure
• Diabetes
• Liver disease
• Malnutrition
Beau’s Nails
• Nails have indentations that run across them.
• They can appear when growth at the area under your
cuticle is interrupted by injury or severe illness.
• Diseases or illnesses associated with Beau's lines include:
• Uncontrolled diabetes
• Circulatory diseases, such as peripheral artery
disease
• Illness associated with a high fever, caused by
pneumonia, scarlet fever, mumps or measles
• Malnutrition
Onycholysis
• Fingernails become loose and can separate
from the nail bed.
• If your nails show signs of detaching, this may
be associated with:
• Injury or infection
• Thyroid disease
• Drug reactions
• Reactions to nail hardeners or acrylic nails
• Psoriasis