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stratified squamous epithelium composed several layers of cells produced by proliferation from the original single layer.
Epidermis
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consists of white, fibrous connective tissue either loose irregular or dense parallel
Dermis
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5 layers of Human Skin
- Stratum Corneum
- Stratum Lucidum
- Stratum Granulosum
- Stratum Spinosum
- Stratum Basale
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Type of cells lining the mucus gland
simple cuboidal cells
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Type of cells lining the poison gland
simple squamous epithelium
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Characteristic of elasmobranch fishes
Placoid Scales
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Consists of basal plate and spine
Placoid Scales
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Usually termed as denticles
Placoid Scales
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Characteristic of extinct fishes: Crossoptergygi and Dipnoi
Cosmoid Scales
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Characteristic of extinct fishes: Chondrostei
Palaeoniscoid Scales
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Lepidosteiod scale
Ganoid Scales
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characteristic of gar, pikes, sturgeons
Ganoid Scales
-
consists of lamellae of ganoin
Ganoid Scales
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stiff, hard scales
Ganoid Scales
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thin,flexible scales
Cycloid Scales
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scales consist of fibrous connective tissue
Cycloid Scales
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present in Holostei, Dipnoi and Teleostei
Cycloid Scales
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-occurs in half of fishes
Ctenoid Scales
-
-differs from cycloid in that the free part is covered with small teeth
Ctenoid Scales
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slender,flexible,unjointed fin rays
Ceratotrichia
-
Fin rays found in elasmobranchs and Holocephali
Ceratotrichia
-
fin rays consist of fibrous material
Ceratotrichia
-
dermal fin rays occur during development of bony fish
Actinotrichia
-
dermal fin rays persist in a few fins and near growing edge of fins
Actinotrichia
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dermal fin rays: branched jointed rays
Lepidotrichia
-
Dermal fin rays: characteristic of Osteichthyes (bony fish)
Lepidotrichia
-
-characteristic of Dipnoi (Lungfish)
Camptotrichia
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