Frog Anatomy

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.

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.

Frogs and Toads

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

External Anatomy

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

Internal Structures

Excretory and Reproductive Systems

The urinary bladder is attached to the ventral wall of the cloaca.

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

Reproduction

• External fertilization• Usually in water• Larvae (tadpoles) hatch from eggs• Larval stage from a few weeks to two

years depending on species

Skeletal/Muscular

• Skeleton of bone• Most prominent feature:

– Very long hind legs for jumping and swimming

Circulatory System

• Three chambered heart• ‘Double Loop’ circulation

– to lungs to get oxygen– To body to deliver oxygen

• Mixing of oxygenated and deoxygenated blood

PERCH DISSECTIONLAB ID PICTURES

ANTERIOR DORSAL FIN

CAUDAL FIN

ANAL FIN

GILL ARCH

INTESTINE

LATERAL LINE

HEART

ANUS

LATERAL PELVIC FIN

LIVER

PECTORAL FIN

PELVIC FIN VENTRAL VIEW

POSTERIOR DORSAL FIN

SPLEEN

STOMACH

SWIM BLADDER

UROGENITAL OPENING