• 18 parts
  • Checked September 2026

Frog Diagram Labeled

A frog from the side, then opened from below as in a school dissection.

Frog Diagram Labeled

Name Date

Tap any part to read, rename or leave it out

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18
More options

Write the name of each numbered part.Answer key

  1. Eye
  2. Nostril
  3. Mouth
  4. Tympanic membrane (eardrum)
  5. Fore limb
  6. Hind limb
  7. Webbed foot
  8. Cloaca (vent)
  9. Heart
  10. Lungs
  11. Liver
  12. Gallbladder
  13. Stomach
  14. Pancreas
  15. Small intestine
  16. Large intestine
  17. Kidneys
  18. Bladder

Drawn for this site by script, 2026-09-27. Licence: own work.

Each numbered ring is a button. Use the arrow keys to move between them and Enter to choose. Names are read out in Study, and once a part is answered.

Next step Next: the earthworm, outside and in

All 18 parts on the diagram

Show the list

Outside: 8 8

  1. Eye The large eye on top of the head. Its lower lid is thin and see-through and can be drawn up over the eye.
  2. Nostril One of two small openings on top of the snout. They lead through to the roof of the mouth.
  3. Mouth A wide slit running back from the tip of the snout.
  4. Tympanic membrane (eardrum) The frog's eardrum: a round patch of skin just behind the eye. Frogs have no outer ear.
  5. Fore limb The short front leg: arm, forearm and a hand with four fingers.
  6. Hind limb The long back leg, folded up at rest: thigh, leg and foot. It is much longer than the fore limb, for leaping.
  7. Webbed foot Five long toes joined by webs of skin for swimming.
  8. Cloaca (vent) The single opening at the back end of the body. Waste from the gut and urine from the bladder both leave through it.

Inside: 10 10

  1. Heart The heart, in the middle between the lungs. A frog's heart has three chambers.
  2. Lungs Two thin, stretchy sacs beside the heart, partly hidden under the liver. A frog also breathes through its skin.
  3. Liver A large reddish-brown organ with two lobes, just below the heart. It makes bile.
  4. Gallbladder A small sac between the lobes of the liver. It stores the bile the liver makes.
  5. Stomach A curved sac under the liver's left lobe. Food is churned and digestion begins here.
  6. Pancreas A small organ near the stomach. Its juice flows into the small intestine and helps digest food.
  7. Small intestine The long, coiled tube where most food is digested and taken in.
  8. Large intestine The wide tube at the back of the gut. It takes water from the waste before it goes out through the cloaca.
  9. Kidneys Two long, dark red organs against the back wall. They take waste out of the blood.
  10. Bladder A thin-walled, two-lobed sac at the back end of the body cavity. It stores urine.

How this list was compiled: Read 2026-09-27. (1) A. Milnes Marshall, The Frog: an Introduction to Anatomy, Histology and Embryology, 5th edition (1894), https://archive.org/details/frogintroduction01mars : the eyes with a thick upper lid and a thin, freely moveable lower lid; the tympanic membrane behind the eye; the fore limb of arm, forearm and hand with four digits; the hind limb of thigh, leg and foot with five webbed toes, much longer than the fore limb; the mouth; the nostrils or anterior nares; the cloacal aperture; the heart between the lungs; the bilobed liver; the gall bladder; the stomach under the liver's left lobe; the pancreas; the small intestine and the wider large intestine; the kidneys; the bilobed bladder. (2) Wikipedia, Frog, https://en.wikipedia.org/wiki/Frog : no external ears, the tympanic membranes visible just behind the eye; eyelids and a nictitating membrane; a three-chambered heart; breathing with lungs and through the skin; the oesophagus, stomach, small intestine and large intestine; the liver, gall bladder and pancreas; two kidneys, the urinary bladder and the cloaca; webbed feet in aquatic frogs. Licence: own work

The drawing: Drawn for this site by script, 2026-09-27. Own work, nothing traced. Licence: own work

How it works

A frog labeled outside and in: first sitting, from the side, then on its back and opened from below the way a school dissection opens it. In the second view the frog's left is on your right.

Read the full guide

Outside

Behind the big eye is the tympanic membrane, the frog's eardrum. The nostrils sit near the tip of the snout above the wide mouth. The short fore limb has four fingers; the long hind limb ends in a webbed foot. The cloaca is the single opening at the back.

Inside

The heart sits between the lungs, above the two-lobed liver and its gall bladder. Food passes from the stomach through the coiled small intestine to the wide large intestine. The kidneys lie against the back, and the bladder sits at the back end.

  • In a dissection the frog lies on its back, so its left is on your right. That is why the stomach appears on the right.

Questions and answers

Do frogs have ears?

Not outer ears. The eardrum, called the tympanic membrane, is the round patch of skin just behind each eye.

What is the path of food through a frog?

Mouth, oesophagus, stomach, small intestine, large intestine and out through the cloaca. The liver, gall bladder and pancreas add their juices to the small intestine.

How many chambers does a frog's heart have?

Three: two atria, which take in blood, and a single ventricle, which pumps it out to the lungs and the body.

How does a frog breathe?

With its two lungs, and also through its thin, moist skin, which lets oxygen pass straight into the blood.

More quizzes

Show 8 more

Browse Science Quizzes