Download Frog Dissection

Frog Dissection
The mouth, nostrils, and eyes
1. Nictictating
membraneProtects eyes (similar
to an eyelid)
2.Tympanic membrane
– the ear drum
Collects sound
waves
Allows frogs to hear
in water
Examine the Mouth
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•
1. Maxillary Teeth – (along inner edge of upper jaw)
3. Vomerine Teeth – (roof of mouth)
– Teeth are used to hold onto caught prey, do not use them to chew, they
swallow prey whole!!
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•
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6. Opening to Eustachian tubes
2. internal Nares
8 Glottis
• 10.Internal Nares –
internal nostril openings
on either side of the
vomerine teeth.
• 11.Eustachian tube
openings –connenct
mouth cavity and the
tympanic membrane
– Help to equalize
internal ear pressure
– If the frog is male,
these are near the
openings to the vocal
sacs which allow male
frogs to make sounds
• 50.Vomerine teeth
Internal Structure -Female
• 31.Eggs
• 32.Oviduct – tubes which carry the eggs after they have
been made
• 22 – Eggs
• 18 – Liver –
– 3 lobed structure that
produces bile for lipid
digestion and starch
– Food does not pass
through, but blood does
– Still considered as part of
digestive system
• 9- Stomach
• 6 – Ventricle of heart
• 12 – small intestine
The Heart – 3 chambered structure
• 34.Conus
arteriosus
• 35.Atrium
• 36.Ventricle
19 – Pericardium – membrane that
surrounds the heart.
Heart – Circulatory System
• 1. Ventricle
• 2. Right atrium
• 3. Left atrium
• 4. Sinus venosus
– Triangular sac
underneath the heart
– Veins from all over the
body empty here before
going into the right
atrium
– Part of circulatory system
The Lungs
• Lungs
– 2 sac like structures on either side of the heart
– Collect oxygen from air and transfer it to blood
supply
– Part of respiratory system
7- Right Lung and 8 –Left Lung
Digestive system
• 16.Small intestine
– At lower end of the
stomach
– Breaks soupy mixture
from stomach into
usable nutrients using
bile from liver and
enzymes from the
pancreas
• 17.Liver • 18.Large intestine
– Collects waste from
tissues and wastes that
could not be absorbed
by the small intestine.
• 19.Stomach – secretes
digestive juices to break
down whole food
swallowed by the frog
into a soupy mixture
• 26.Spleen –filters
improperly
functioning blood
cells; circulatory
system
• 29.Teste
10 – pancreas
Secretes enzymes into small intestine
19 – stomach
54 - pancreas
Digestive system
• 16.Small
intestine
• 19.Stomach
• 33.Gall
bladder
11- Pylorus- muscular valve between the stomach
and small intestine
23 – Kidney
Located in either side of the spine, near the dorsal side;
filter blood and urine that drains into the urinary bladder;
excretory system
• 23 & 24 Kidneys
• 21 – Fat Bodies
• 27 – Urinary Bladder
– urine travels from
the kidneys, down
tubes called
ureters to this
bladder where it is
stored until
emptied through
the cloaca.
• 21 – Fat Bodies
– Attached near
kidneys
– Store fat for
nourishment for the
gametes
– Much larger and
more abundant in
females
• 22-Testes
– Small, oval
structure
underneath kidneys
– Sperm travels
through the
kidneys, down the
ureters and out the
cloaca.
• 23 & 24 Kidneys