Frog Anatomy and Dissection

In the lab, you will be spending a few days, dissecting the frog. Periodically, your instructor may pause to show you illustrations, diagrams or videos of procedures. This page is additional information that may be given to you in class as you perform the dissection.

The Mouth

frog mouth


Vomerine Teeth: Used for holding prey, located at the roof of the mouth

Maxillary Teeth: Used for holding prey, located around the edge of the mouth

Internal Nares (nostrils) breathing, connect to lungs

Eustachian Tubes: equalize pressure in inner ear

Glottis : Tube leading to the lungs

Esophagus: Tube leading to the stomach

Tongue: Front attached, aids in grabbing prey

Tympanic Membrane: eardrum, located behind eyes

Nictitating Membrane: clear eyelid, protects the eye

The Organs of the Abdominal Cavity

Peritoneum: Spiderweb like membrane that covers organs

Stomach: First site of chemical digestion, breaks down food

Liver: Makes bile (aids in digestion)

Gall bladder: Stores bile

Esophagus: Tube that leads to the stomach

Pancreas: Makes insulin (aids in digestion)

Small Intestine (duodenum and ileum): absorb nutrients from food

Mesentery: Holds coils of the small intestine together

Large Intestine: Collects waste, absorbs water

Cloaca: "Sewer": eggs, sperm, urine and feces enter this area

Spleen: Part of circulatory system, stores blood

sketch of digestive system


The Urogenital System

urogenital system

Kidneys (D): Filter Blood

Ureters (G): Carry urine from kidneys to bladder

Testes (C): Make sperm

Oviducts (B): eggs travel through these

Ovary: makes eggs (A) - ovary is often too small to see, but eggs are visible

Urinary Bladder (F): Stores Urine

Cloaca (E): Where sperm, eggs, urine, and feces exit.