Frog Dissection Pre-Lab
Dissection
• Respect for living
things and the
environment is
considered
essential for
meaningful work in
science and
technology.
Making Incisions
• Rinse the frog in
water
• Place the frog in the
dissection tray on
its back. Pin (or tie)
the limbs to the tray.
Making Incisions
• Lift the frog’s skin
between the rear
legs with the
forceps
• Use the scalpel to
cut through the
lifted skin, making
the incision shown.
Be careful to cut
only the skin.
Making Incisions
• Repeat the incisions
cutting through the
muscle and bone
layers
• Be careful not to cut
too deep or you may
damage the organs
underneath.
Internal Examination
• Identify all of the
organs in the frog
–
–
–
–
–
A = Heart
B = Liver
C = Stomach
D = Intestine
E = Ventral Vein
• Draw and label
these organs on the
frog diagram
provided.
Respiratory System
• Use the labelled
diagram to identify
all of the organs.
Circulatory System
• Lift the liver gently
to reveal the heart
below
• Remove the liver to
reveal the gall
bladder and
pancreas.
Digestive System
• The heart and liver
cover the digestive
organs below them
• Remove the liver to
reveal the gall
bladder, stomach
and pancreas.
Digestive System
• Remove the
stomach to reveal
the other parts of
the digestive system
• The spleen, the
large and small
intestines
Reproductive System
• Identify if your frog is male or female
Excretory System
• Try to identify the kidneys
– Long narrows organs lying against the dorsal wall