Frog Dissection Review Objectives: Describe the appearance of various organs found in the frog Name the organs that make up various systems of the frog Discuss frog adaptations

Frog Dissection Review What does a frog’s anatomy have in common with a human’s? Frogs have all the same body systems as people and most of the same organs! How does a frog’s anatomy differ from a human’s? Frogs have: a cloaca three-chambered heart unique teeth – vomerine and maxillary no external ear third eyelid – nictitating membrane they are also cold blooded

Step One Determine frog’s sex: males have thick pads on thumbs; males are often smaller than females. Male is on the right

Step Two Locate external features of frog Mouth, external nares, tympani, eyes and nictating membranes Tympanic membrane External Nares Nictitating membrane

Materials Dissecting Kit: pins, forceps, scissors, probe

Step Three Locate the structures inside the mouth: Vomerine teeth, Maxillary teeth, Internal nares, Tongue, Eustachian tubes, Esophagus, and Glottis. Internal nares Internal nares Maxillary teeth Vomerine Teeth Vomerine teeth Eustachian tube Glottis Glottis Esophagus Tongue

Step Five Locate organs of digestive system: esophagus, stomach, small intestine, pancreas, liver, gall bladder, lungs lungs Liver Gall bladder Pancreas Stomach Small intestine

Fat bodies Spleen Large Intestine Rectum Large intestine Small Intestine

Step Six Locate the circulatory organs: heart with right and left atrium and one ventricle Left atrium Ventricle Right atrium

Male or Female Reproductive Parts testis Fat Bodies Fat bodies ovaries

Frog Anatomy Wrap-up What are the functions of the following organs: 1. Cloaca Organ that eliminates urine, feces and sperm/egg 2. Tympanum External eardrum of the frog; help with hearing 3. Nictating Membrane Third eyelid that protects while eating and under water 4. Vomerine Teeth Teeth located on roof of mouth that help grab on to prey