integument - dalhousie university...integument - form vs function in the vertebrates physical...
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INTEGUMENT
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INTEGUMENT - FORM VS FUNCTION IN THE VERTEBRATES
PHYSICAL BARRIER - allows HOMEOSTASIS
MECHANICAL PROTECTION
stress, abrasion, puncture
CONFLICT - protection vs flexibility
PERMEABILITY - ADJUSTABLE
ion and water balance
gas exchange
varies with environment - aquatic vs terrestrial
THERMOREGULATION
control blood flow - heat loss/gain
sweat
insulation
SIGNALLING/DEFENCE
pigments - cryptic/warning for predators
secretions - pheromones/toxins
SENSORY
mechanoreception
thermoreception
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INTEGUMENT IN FISHES
-no keratinized outer layer
-mucus - protection
-scales
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CVH slide 100 lamprey skin
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LAMPREY EPIDERMIS CVH100
mucus cell club cell
granule cell
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DOGFISH EPIDERMIS CVH 77
mucus cell club cell
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TELEOST EPIDERMIS CVH 155
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CVH slide 100 lamprey skin - melanocytes in dermis
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DOGFISH SKIN CVH 77
mucus cell club cell
melanocytes in dermis
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DOGFISH DERMAL LAYERS CVH 77
stratum
spongiosum
stratum
compactum
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LAMPREY EPIDERMIS CVH100 - no stratum spongiosum
mucus cell club cell
granule cell
stratum compactum
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FISH SCALES: in dermis
elasmobranchs - placoid scales
same structure as teeth - dentin core,
enamel outer layer
teleosts - bony scales
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DOGFISH: DEVELOPING PLACOID SCALES CVH 61
odontoblasts making enamel
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HEAD OF DEVELOPING DOGFISH sagittal section CVH 61
mouth
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LOWER JAW WITH DEVELOPING DERMAL DENTICLES
CVH 61
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UNERUPTED DERMAL DENTICLE CVH 61
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TELEOST DERMAL SCALES CVH 155
scale
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TIP OF DERMAL SCALE - epidermis folded over edge
CVH155
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BASE OF SCALE (*) ANCHORED IN DERMIS CVH 155
*
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INTEGUMENT IN AMPHIBIANS
-in transition to terrestrial living
(still spawn in water)
-aquatic or partly aquatic forms
- mucus skin covering
-first vertebrate keratinization
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Ambystoma - semi-aquatic salamander
mucus layer
Sheldon, amphibiainfo.com
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FROG SKIN - GLANDS IN DERMIS (CVH32)
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FROG SKIN - GLANDS IN DERMIS (CVH32)
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STRATUM
CORNEUM
IN TOAD
LEG SKIN
CVH 164
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DERMAL CHROMATOPHORES
melanocytes - brown/black pigment granules
xanthophores - yellow oil droplets
erythrophores - red oil droplets
iridophores - protein plates - reflect light - silvery
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DEFENSIVE
COLORATION
IN AMPHIBIANS
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INTEGUMENT IN REPTILES
-fully terrestrial (lay eggs)
-scales - modified stratum corneum
-ecdysis (molting)
continuous - crocodilians, turtles
periodic - lizards, snakes
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outer scale inner scale
SNAKE INTEGUMENT CVH 108
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hinge region
SNAKE INTEGUMENT CVH 108
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INTEGUMENT IN BIRDS
-keratinized structures derived from
epidermis
feathers
beak
scales
-dermis - thin, anchors feathers
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BIRD SKIN BETWEEN FEATHER FOLLICLES CVH 112
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FEATHER FOLLICLES (F) IN BIRD SKIN (CVH112)
F epidermis
dermis
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MAMMALIAN INTEGUMENT
-structure similar to human
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MAMMALIAN INTEGUMENT
-structure similar to human
-epidermally derived specialized structures - keratinized
fur/wool/hair
horns, antlers, hooves, claws
scales - rodent, opossums
shells - armadillo - keratin plates over dermal bone
baleen plates - filters for krill feeders
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BALEEN FILTER IN MOUTH OF BLUE WHALE
alumniexhibits.com