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Frog Disection

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by

Adeline Bazard

on 16 May 2014

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Transcript of Frog Disection

Frog Dissection
Urogenital System
External Anatomy
The color of the Ventral side is beige and pink.
The color of the Dorsal side is brown and spotted.
There are 5 toes on the hind leg sand they are webbed.
There are 4 toes on the fore legs and they are not webbed.
The nictitating membrane is clear and the eyes are pink.
Tympanic membrane is 1 centimeter in diameter.
The skin is slimy.


Internal Anatomy

Frog's Brain

Frog's Bones
Fat Bodies
Fat Bodies are spaghetti shaped structures that have a bright orange or yellow color; if you have a particularly fat frog, these fat bodies may need to be removed to see the other structures. Usually they are located just on the inside of the abdominal wall.

Peritoneum
­ Peritoneum is spider web like membrane that covers many of the organs.

Liver
Heart
The heart is the largest structure of the the body cavity. This brown colored organ is composed of three parts, or lobes. The right lobe, the left anterior lobe, and the left posterior lobe. The liver is not primarily an organ of digestion, it does secrete a digestive juice called bile. Bile is needed for the proper digestion of fats.

Gall Bladder
The gall bladder, stores bile.

The largest structure of the the body cavity is the liver. This brown colored organ is composed of three parts, or lobes. The right lobe, the left anterior lobe, and the left posterior lobe. The liver is not primarily an organ of digestion, it does secrete a digestive juice called bile. Bile is needed for the proper digestion of fats.

Lungs
They are two spongy organs that allow the frog to breath.
Stomach
The stomach is the first major site of chemical digestion. Frogs swallow their meals whole. Follow the stomach to where it turns into the small intestine. The pyloric sphincter valve regulates the exit of digested food from the stomach to the small intestine.
Small Intestine
The first straight portion of the small intestine is called the duodenum, the curled portion is the ileum. The ileum is held together by a membrane called the mesentery. Absorption of digested nutrients occurs in the small intestine.
Large Intestine
The large intestine is also known as the cloaca in the frog. The cloaca is the last stop before wastes, sperm, or urine exit the frog's body.
Spleen
Return to the folds of the mesentery, this dark red spherical object serves as a holding area for blood.
Esophagus
The esophagus is the tube that leads from the frogs mouth to the stomach.
Kidneys
A flattened bean shaped organs located at the lower back of the frog, near the spine. They are often a dark color. The kidneys filter wastes from the blood. Often the top of the kidneys have yellowish stringy fat bodies attached.
Oviducts
Oviducts are where eggs are produced.
Bladder
An empty sac located at the lowest part of the body cavity. The bladder stores urine.
Cloaca
A part of the urogenital system - urine, sperm and eggs exit here.
Post -Lab Questions
1. The membrane holds the coils of the small intestine together:
mesentrey
2.This organ is found under the liver, it stores bile:
Gal Bladder
3. Name the 3 lobes of the liver:
right lobe, left anterior lobe, and left posterior lobe
4. The organ that is the first major site of chemical digestion:
stomach
5. Eggs, sperm, urine and wastes all empty into this structure:
Cloaca
6. The small intestine leads to the:
Stomach
7. The esophagus leads to the:
Stomach
8. Yellowish structures that serve as an energy reserve:
Fat Bodies
9. The first part of the small intestine(straight part):
Duodenum
10. After food passes through the stomach it enters the:
Small Intestine
11. A spiderweb like membrane that covers the organs
:Peritoneum
12. Regulates the exit of partially digested food from the stomach: P
yloric Sphincter Valve
13. The large intestine leads to the
Cloaca
14. Organ found within the mesentery that stores blood:
Small Intestine
15. The largest organ in the body cavity:
Liver

Femur,
Tibiofibula,
Tarsals,
Metatarsals,
Pelvic girdle

Cerebellum- coordination and balance (D)
Cerebrum -response to environement(B)
Olfactory Lobe-sense of smell (A)
Optic Lobe-vision (C)
Medulla Oblongata -connects to spinal cord (E)
Anatomy of Mouth
Post- Lab Questions continued
Full transcript