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Frog Dissection Fall 2000 Jenna Hellack Dissection index Frog legs •Hindlegs are strong and muscular because they are used for jumping •Forelegs provide balance and cushion the frog when it lands after jumping Jenna Hellack Fall 2000 Dissection index Frog Toes Fingers Jenna Hellack Fall 2000 Toes Dissection index Frog Eye • The frog has large bulging eyes • The frog has 3 eyelids – 2 outer ones are the color of the frog’s body and do not move – 3rd eyelid is a transparent membrane that protects the eye while permitting the frog to see under water • It also keeps the eye moist when the frog is on land Jenna Hellack Fall 2000 Dissection index Eardrum and External Nares • Behind the eye is the circular eardrum • 2 openings in the nasal cavity-external nares are found toward the tip of the snout – These will close when the frog is under water Jenna Hellack Fall 2000 Dissection index The Frog Eye Nasal Openings Eardrum forelegs hindlegs Jenna Hellack Fall 2000 Dissection index Frog Skin • Smooth, moist, and thin • Frog can breathe directly through skin as well as with lungs Jenna Hellack Fall 2000 Dissection index Coloration • Notice the difference in coloring between the belly and the rest of the frog’s body Jenna Hellack Fall 2000 Dissection index Frog Tongue • Attached to the front of the mouth • Sticky- used to catch insects Jenna Hellack Fall 2000 Dissection index Frog Teeth • Ridges along the inside of upper jaw are maxillary teeth • 2 vomerine teeth are located toward the front of the upper jaw Jenna Hellack Fall 2000 Dissection index Gullet & Eustachian tubes • The gullet (throat) is the wide opening that leads to the esophagus • On both sides of the gulled near the jaw hinges are openings to the Eustachian tube. – These lead to the eardrum Gullet Jenna Hellack Fall 2000 Dissection index Frog Mouth Gullet Jenna Hellack Fall 2000 Dissection index Female with eggs A female frog has ovaries which are easily identifiable if engorged with eggs. Jenna Hellack Fall 2000 Dissection index Male The male's testes are a bright orange color. Testes Jenna Hellack Fall 2000 Dissection index Liver: The liver secretes bile to aid in digestion of fats. Jenna Hellack Fall 2000 Dissection index Gall Bladder 40 38 44. Gall bladder 42 43 39 • Greenish sac attached to the liver • It stores bile, which breaks down fats during digestion 44 56 55 50 46 52 51 49 47 Jenna Hellack Fall 2000 Dissection index Stomach •Below the liver •Large and white •On the right side as you look at the frog •Connects to the small intestine Jenna Hellack Fall 2000 Dissection index Small Intestines • The straight part of the small intestine is called the duodenum • The coiled section is the ileum Jenna Hellack Fall 2000 Dissection index Mesentery & Ileum • The coils of the ileum are connected by thin, transparent membranes called mesenteries. Jenna Hellack Fall 2000 Dissection index Large Intestine • The small intestine widens to form the large intestine. • The lower portion of the large intestine is called the cloaca. Jenna Hellack Fall 2000 Dissection index Pancreas • In the mesentery along the inner curve of the stomach is the pancreas which secretes digestive enzymes and insulin into the duodenum. Jenna Hellack Fall 2000 Dissection index Spleen 40 49. Spleen 38 42 • In the mesentery of the coiled part of the small intestine • Reddish, spherical structure • The spleen is an organ in the frog’s circulatory system that makes, stores, and destroys blood cells 43 39 44 56 55 50 46 52 51 49 47 Jenna Hellack Fall 2000 Dissection index Lungs • 2 Lungs – Reddish-brown saclike structures Jenna Hellack Fall 2000 Dissection index Frog Heart • 3 chambers – 2 upper chambers- right and left atria – Lower chamber- ventricle Jenna Hellack Fall 2000 Dissection index Kidney 2 dark-red kidneys attached to the back wall of the abdominal cavity. Kidneys filter out impurities from the blood. Jenna Hellack Fall 2000 Dissection index Urinary Bladder 52. Urinary bladder Jenna Hellack Fall 2000 • Urinary bladder empties into the cloaca • Ureters-tubes leading from each kidney to the bladder Dissection index Frog internals- female 45. 46. 47. 48. 49. 51. 52. 58. 59. Jenna Hellack Fall 2000 Stomach Small intestine Large intestine Pancreas Spleen Fat bodies Urinary bladder Ovary Oviduct Dissection index Internal Organs Jenna Hellack Fall 2000 Dissection index Metamorphosis Jenna Hellack Fall 2000
