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Frog Dissection
Fall 2000
Jenna Hellack
Dissection index
Frog legs
•Hindlegs are strong and
muscular because they are
used for jumping
•Forelegs provide balance
and cushion the frog when it
lands after jumping
Jenna Hellack Fall 2000
Dissection index
Frog Toes
Fingers
Jenna Hellack Fall 2000
Toes
Dissection index
Frog Eye
• The frog has large bulging eyes
• The frog has 3 eyelids
– 2 outer ones are the color of the frog’s body
and do not move
– 3rd eyelid is a transparent membrane that
protects the eye while permitting the frog to
see under water
• It also keeps the eye moist when the frog is on land
Jenna Hellack Fall 2000
Dissection index
Eardrum and External Nares
• Behind the eye is the circular eardrum
• 2 openings in the nasal cavity-external
nares are found toward the tip of the snout
– These will close when the frog is under water
Jenna Hellack Fall 2000
Dissection index
The Frog
Eye
Nasal
Openings
Eardrum
forelegs
hindlegs
Jenna Hellack Fall 2000
Dissection index
Frog Skin
• Smooth, moist, and thin
• Frog can breathe directly through skin as
well as with lungs
Jenna Hellack Fall 2000
Dissection index
Coloration
• Notice the difference in coloring between
the belly and the rest of the frog’s body
Jenna Hellack Fall 2000
Dissection index
Frog Tongue
• Attached to the front of the mouth
• Sticky- used to catch insects
Jenna Hellack Fall 2000
Dissection index
Frog Teeth
• Ridges along the inside of upper jaw are
maxillary teeth
• 2 vomerine teeth are located toward the
front of the upper jaw
Jenna Hellack Fall 2000
Dissection index
Gullet & Eustachian tubes
• The gullet (throat) is the wide opening that
leads to the esophagus
• On both sides of the gulled near the jaw
hinges are openings to the Eustachian tube.
– These lead to the eardrum
Gullet
Jenna Hellack Fall 2000
Dissection index
Frog Mouth
Gullet
Jenna Hellack Fall 2000
Dissection index
Female with eggs
A female frog has ovaries which are easily identifiable if engorged with eggs.
Jenna Hellack Fall 2000
Dissection index
Male
The male's testes are a bright orange color.
Testes
Jenna Hellack Fall 2000
Dissection index
Liver: The liver secretes bile
to aid in digestion of fats.
Jenna Hellack Fall 2000
Dissection index
Gall Bladder
40
38
44. Gall bladder
42
43
39
•
Greenish sac
attached to the
liver
•
It stores bile,
which breaks
down fats during
digestion
44
56
55
50
46
52
51
49
47
Jenna Hellack Fall 2000
Dissection index
Stomach
•Below the liver
•Large and white
•On the right side
as you look at the
frog
•Connects to the
small intestine
Jenna Hellack Fall 2000
Dissection index
Small Intestines
• The straight part of the small intestine is
called the duodenum
• The coiled section is the ileum
Jenna Hellack Fall 2000
Dissection index
Mesentery & Ileum
• The coils of the ileum are connected by
thin, transparent membranes called
mesenteries.
Jenna Hellack Fall 2000
Dissection index
Large Intestine
• The small intestine widens to form the large intestine.
• The lower portion of the large intestine is called the cloaca.
Jenna Hellack Fall 2000
Dissection index
Pancreas
• In the mesentery along the inner curve of the stomach is
the pancreas which secretes digestive enzymes and
insulin into the duodenum.
Jenna Hellack Fall 2000
Dissection index
Spleen
40
49. Spleen
38
42
•
In the mesentery of the
coiled part of the small
intestine
•
Reddish, spherical
structure
•
The spleen is an organ
in the frog’s circulatory
system that makes,
stores, and destroys
blood cells
43
39
44
56
55
50
46
52
51
49
47
Jenna Hellack Fall 2000
Dissection index
Lungs
• 2 Lungs
– Reddish-brown saclike structures
Jenna Hellack Fall 2000
Dissection index
Frog Heart
• 3 chambers
– 2 upper chambers- right and left atria
– Lower chamber- ventricle
Jenna Hellack Fall 2000
Dissection index
Kidney
2 dark-red kidneys attached to the back wall of the abdominal
cavity. Kidneys filter out impurities from the blood.
Jenna Hellack Fall 2000
Dissection index
Urinary Bladder
52. Urinary bladder
Jenna Hellack Fall 2000
•
Urinary bladder
empties into the
cloaca
•
Ureters-tubes
leading from each
kidney to the
bladder
Dissection index
Frog internals- female
45.
46.
47.
48.
49.
51.
52.
58.
59.
Jenna Hellack Fall 2000
Stomach
Small intestine
Large intestine
Pancreas
Spleen
Fat bodies
Urinary bladder
Ovary
Oviduct
Dissection index
Internal Organs
Jenna Hellack Fall 2000
Dissection index
Metamorphosis
Jenna Hellack Fall 2000