• 21 parts
  • Checked September 2026

Fetal Pig Diagram Labeled Answers

A fetal pig on its back in four views, from the whole animal down to the kidneys.

Fetal Pig Diagram Labeled Answers

Name Date

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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21
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Write the name of each numbered part.Answer key

  1. Lungs
  2. Heart
  3. Diaphragm
  4. Liver
  5. Small intestine
  6. Umbilical cord
  7. Larynx
  8. Trachea
  9. Thyroid gland
  10. Thymus
  11. Ribs
  12. Stomach
  13. Spleen
  14. Spiral colon
  15. Umbilical vein
  16. Kidneys
  17. Aorta
  18. Posterior vena cava
  19. Rectum
  20. Urinary bladder
  21. Umbilical arteries

Drawn for this site on 2026-09-30 from plain geometry. 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 human respiratory system

All 21 parts on the diagram

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The whole pig 6

  1. Lungs They fill most of the chest. A fetus does not breathe with its own lungs, so they have never held air.
  2. Heart It lies in the middle of the chest. It is inside a thin sac, the pericardium, with its point toward the diaphragm.
  3. Diaphragm A thin muscle sheet dividing the chest from the abdomen behind it. The chest holds the heart and lungs.
  4. Liver The largest organ in the abdomen. It lies against the diaphragm and covers most of the stomach.
  5. Small intestine It leaves the stomach as the duodenum and lies in many loops. A thin sheet called the mesentery holds them together.
  6. Umbilical cord It holds two umbilical arteries and one larger umbilical vein. It is turned back toward the tail on a flap of the body wall.

Neck and chest 5

  1. Larynx The voice box: a firm enlargement of cartilage where the windpipe begins.
  2. Trachea The windpipe. Rings of cartilage hold it open. It runs from the larynx down the neck and divides into two bronchi that enter the lungs.
  3. Thyroid gland A small gland on the underside of the trachea. It lies a little behind the larynx.
  4. Thymus Soft tissue in lobes down both sides of the trachea. It also lies over the front of the heart. T cells, a kind of white blood cell, mature in it.
  5. Ribs The ribs protect the heart and lungs. Here only their cut ends show, along both edges of the opened chest.

Abdomen 4

  1. Stomach It lies on the left side of the pig. It is mostly hidden under the liver until the liver is lifted.
  2. Spleen An elongated, flat organ along the outer curve of the stomach.
  3. Spiral colon Most of the pig's large intestine, wound into a compact coiled mass. It lies on the left side.
  4. Umbilical vein Carried oxygen-rich blood from the placenta through the cord to the liver.

Back of the abdomen 6

  1. Kidneys They lie against the back wall of the abdomen. One is on each side of the backbone. A ureter runs from each to the bladder.
  2. Aorta The main artery of the body. Near its end it gives off the two umbilical arteries.
  3. Posterior vena cava The large vein from the rear of the body. It carries blood forward to the heart.
  4. Rectum The last part of the large intestine. It runs back along the midline through the pelvis.
  5. Urinary bladder In the fetal pig the bladder is a long, narrow sac. It lies on the flap, between the two umbilical arteries.
  6. Umbilical arteries Carried blood from the fetus out through the cord to the placenta. One of the two arteries runs along each side of the bladder.

How this list was compiled: Every name checked on 2026-09-30 in two fetal pig dissection guides read through the Internet Archive's full-text search: F. Bohensky, Photo Manual and Dissection Guide of the Fetal Pig (1978), https://archive.org/details/photomanualdisse0000fred_u2p3, and D. G. Smith and M. P. Schenk, Dissection Guide and Atlas to the Fetal Pig, https://archive.org/details/dissectionguidea0000unse; and Septimus Sisson, The Anatomy of the Domestic Animals (1914), for the pig's organs, https://archive.org/details/anatomyofdomesti00siss. What the fetal vessels carry is from OpenStax, Anatomy and Physiology 2e, section 20.6, https://openstax.org/books/anatomy-and-physiology-2e/pages/20-6-development-of-blood-vessels-and-fetal-circulation; the thymus, thyroid, larynx and trachea from sections 21.1, 17.4 and 22.1 of the same book. Licence: own work

The drawing: Drawn for this site on 2026-09-30 from plain geometry; nothing traced. Licence: own work

How it works

These fetal pig diagram labeled answers go in the order a class works: the whole pig opened, then the neck and chest, the abdomen, and the back wall once the intestines are lifted out. The pig lies on its back, head to the left.

Read the full guide

Whole pig, then neck and chest

Start with the big organs: lungs, heart, diaphragm, liver, small intestine and the umbilical cord. The close-up of the chest doubles as a pig respiratory system diagram: air goes through the larynx and down the ringed trachea to the lungs. The thyroid gland sits on the trachea and the thymus lies along it.

Abdomen and back wall

The stomach and spleen are on the pig's left, beside the tight coil of the spiral colon. The umbilical vein runs from the cord to the liver. With the intestines lifted out you reach the kidneys, the aorta and posterior vena cava, the rectum, and the urinary bladder between the two umbilical arteries.

  • Left and right swap when the pig is on its back: the stomach and spleen are on the pig's left, not yours.
  • Three vessels run in the cord: two umbilical arteries and one larger umbilical vein.

Questions and answers

What organs do you label on a fetal pig?

In the chest: larynx, trachea, thyroid gland, thymus, lungs, heart and diaphragm. In the abdomen: liver, stomach, spleen, small intestine and spiral colon. Against the back: kidneys, aorta, posterior vena cava, rectum and urinary bladder, with the umbilical vein and arteries.

Where is the urinary bladder in a fetal pig?

On the flap of body wall that carries the umbilical cord. It is a long, narrow sac lying between the two umbilical arteries.

What do the umbilical arteries and vein do?

The umbilical vein carries oxygen-rich blood from the placenta to the fetus, entering at the liver. The two umbilical arteries carry oxygen-poor blood and wastes from the fetus back out to the placenta.

Is this a fetal pig anatomy quiz too?

Yes. Press Quiz me and a part lights up in one of the four views; pick its name from four choices. Parts you miss come back at the end.

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