Frog Dissection The mouth nostrils and eyes 1

Frog Dissection

The mouth, nostrils, and eyes 1. Nictictating membrane. Protects eyes (similar to an eyelid) 2. Tympanic membrane – the ear drum Collects sound waves Allows frogs to hear in water

Examine the Mouth • • 1. Maxillary Teeth – (along inner edge of upper jaw) 3. Vomerine Teeth – (roof of mouth) – Teeth are used to hold onto caught prey, do not use them to chew, they swallow prey whole!! • • • 6. Opening to Eustachian tubes 2. internal Nares 8 Glottis

• 10. Internal Nares – internal nostril openings on either side of the vomerine teeth. • 11. Eustachian tube openings –connenct mouth cavity and the tympanic membrane – Help to equalize internal ear pressure – If the frog is male, these are near the openings to the vocal sacs which allow male frogs to make sounds • 50. Vomerine teeth

Internal Structure -Female • 31. Eggs • 32. Oviduct – tubes which carry the eggs after they have been made

• 22 – Eggs • 18 – Liver – – 3 lobed structure that produces bile for lipid digestion and starch – Food does not pass through, but blood does – Still considered as part of digestive system • 9 - Stomach • 6 – Ventricle of heart • 12 – small intestine

The Heart – 3 chambered structure • 34. Conus arteriosus • 35. Atrium • 36. Ventricle

19 – Pericardium – membrane that surrounds the heart.

Heart – Circulatory System • 1. Ventricle • 2. Right atrium • 3. Left atrium • 4. Sinus venosus – Triangular sac underneath the heart – Veins from all over the body empty here before going into the right atrium – Part of circulatory system

The Lungs • Lungs – 2 sac like structures on either side of the heart – Collect oxygen from air and transfer it to blood supply – Part of respiratory system

7 - Right Lung and 8 –Left Lung

Digestive system • 16. Small intestine – At lower end of the stomach – Breaks soupy mixture from stomach into usable nutrients using bile from liver and enzymes from the pancreas • 17. Liver • 18. Large intestine – Collects waste from tissues and wastes that could not be absorbed by the small intestine. • 19. Stomach – secretes digestive juices to break down whole food swallowed by the frog into a soupy mixture

• 26. Spleen –filters improperly functioning blood cells; circulatory system • 29. Teste

10 – pancreas Secretes enzymes into small intestine

19 – stomach 54 - pancreas

Digestive system • 16. Small intestine • 19. Stomach • 33. Gall bladder

11 - Pylorus- muscular valve between the stomach and small intestine

23 – Kidney Located in either side of the spine, near the dorsal side; filter blood and urine that drains into the urinary bladder; excretory system

• 23 & 24 Kidneys • 21 – Fat Bodies • 27 – Urinary Bladder – urine travels from the kidneys, down tubes called ureters to this bladder where it is stored until emptied through the cloaca.

• 21 – Fat Bodies – Attached near kidneys – Store fat for nourishment for the gametes – Much larger and more abundant in females • 22 -Testes – Small, oval structure underneath kidneys – Sperm travels through the kidneys, down the ureters and out the cloaca. • 23 & 24 Kidneys