frog anatomy 1
TRANSCRIPT
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Frog Anatomy
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Characteristics of All Amphibians
• They are ectothermic vertebrates.– Control body heat by using the environment– Sometimes called cold blooded
• They have three-chambered hearts.
• They lack claws on their toes.
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Characteristics of All Amphibians
• Their skin is usually smooth and lacks scales, hair, and feathers.
• They are dependent upon moisture and subject to dessication ; their skin must remain moist to aid in breathing.
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Frogs and Toads
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FROG TOAD
smooth, moist skin rough, drier skin
no warts on body have warts on body
narrower body and waist broader, flatter body
live near or in water live on land, breed in water only
longer hind legs for hopping
webbed hind feet for swimming
shorter hind legs, walks rather than hop
eggs are in massive lump of cloudy jelly
eggs are long and stringy, wrapped around water plants
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External Anatomy
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Mouth
•Vomarine and Maxillary Teeth: Used for holding prey•Internal Nares (nostrils) breathing•Eustachian Tubes: equalize pressure in inner ear•Glottis : Tube leading to the lungs•Esophagus: Tube leading to the stomach•Tongue: Front attached, aids in grabbing prey
•Tympanic Membrane: eardrum, located behind eyes•Nictitating Membrane: clear eyelid, protects the eye
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Internal Structures
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Excretory and Reproductive Systems
The urinary bladder is attached to the ventral wall of the cloaca.
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Nervous system
• Fairly good eyesight– Protected by nictitating membrane
• Tympanic membrane– Hearing
• Delicate sense of touch• Tongue and mouth have
taste buds• Sense of smell varies with
species
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Reproduction
• External fertilization• Usually in water• Larvae (tadpoles) hatch from eggs• Larval stage from a few weeks to two
years depending on species
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Skeletal/Muscular
• Skeleton of bone• Most prominent feature:
– Very long hind legs for jumping and swimming
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Circulatory System
• Three chambered heart• ‘Double Loop’ circulation
– to lungs to get oxygen– To body to deliver oxygen
• Mixing of oxygenated and deoxygenated blood
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PERCH DISSECTIONLAB ID PICTURES
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ANTERIOR DORSAL FIN
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CAUDAL FIN
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ANAL FIN
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GILL ARCH
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INTESTINE
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LATERAL LINE
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HEART
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ANUS
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LATERAL PELVIC FIN
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LIVER
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PECTORAL FIN
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PELVIC FIN VENTRAL VIEW
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POSTERIOR DORSAL FIN
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SPLEEN
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STOMACH
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SWIM BLADDER
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UROGENITAL OPENING