Frog Dissection

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B. Internal:
The dissectors:
o used hands to turn frog ventral side up, head anterior, hind limbs posterior o used forceps to lift fold of skin directly anterior to hind limbs o used scissors to make small superficial cut

o inserted scissors into cut and continued superficially anterior medial through mandible o used scissors to make 2 lateral superficial cuts just anterior to hind limbs on either side of medial cut and stopped before reaching dorsal surface o used scissors to make 2 lateral superficial cuts just posterior to forelimbs on either side of medial cut and stopped before reaching dorsal surface o used scissors to cut connective tissue between skin and muscles o peeled away left flap of skin with hands and followed blood vessels with dissecting needle o used scissors to cut of left flap of skin and help up to light with hands to notice blood vessels and thinness o used scissors to cut off right flap of skin

o inserted scissors into anus and cut anterior through thin abdominal muscles, through the pectoral girdle, and up through the mandible o used scissors to make 2 lateral cuts just anterior to hind limbs on either side of medial cut and stopped in same place as skin o used scissors to make 2 lateral cuts just posterior to forelimbs on either side of medial cut and stopped in same place as skin o used scissors to cut off left and right flaps of abdominal muscles to make clear window o used hands to sex frog by moving aside organs and located oviducts on top of kidney and noticed absence of eggs o used forceps to lift 3-lobed liver to view stomach and intestines o used forceps to pull out small intestine to view mesentery o used dissecting needle to locate gallbladder right under liver and noticed filled with bile o used forceps to lift small intestine to view spleen embedded against large intestine o used forceps and lifted 3-lobed liver and used dissecting needle to locate thin, ribbon-like pancreas in J pocket of stomach o used forceps and dissecting needle to remove pericardium from heart o used hands to spread pericardial cavity to view left and right truncus arteriosus, conus arteriosus, left and right atria, and the ventricle o lifted heart with forceps to view sinus venosus underneath ventricle that led into right atrium o used hands to move aside fat bodies and organs and used dissecting needles to locate and feel thin lungs on either side of heart o used forceps to lift clear, deflated urinary bladder

Leopard frog
D: Eukarya
K: Animalia
P: Chordata
Sub P: Vertebrata
C: Amphibia
O: Anura
G: Rana
S: R. pipiens

I. Purpose:
To examine the leopard frog
externally and
internally by dissection

II. Materials:
1. Dissection utensils
2. Dissection booklet
3. Dissection video
4. Leopard frog
5. Dissection tray
6. Goggles

Internal 2:

Heart Brain

B. Internal 1:

Color Code:
Skin: gray with black spots
Respiratory: pink
Circulatory: red
Digestive: yellow
Accessory digestive: green
Mesentery: clear
Reproductive: orange
Excretory: brown
Sensory/Nervous: dark blue
Cloaca/Anus: purple
fat bodies fat pad
spleen
kidney
cloaca
cloaca
anus
anus
urinary bladder
large intestine
pharynx
glottis
esophagus...
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