• 24 muscles
  • Checked October 2026

Frog Muscle Quiz

The muscles of a frog in two views: from below, then from above.

Frog Muscle Quiz

Name Date

Which muscle is this?

1 of 12

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Write the name of each numbered muscle.Answer key

  1. Mylohyoid
  2. Pectoralis
  3. Deltoid
  4. Rectus abdominis
  5. External oblique
  6. Triceps femoris
  7. Adductor longus
  8. Sartorius
  9. Adductor magnus
  10. Gracilis major (rectus internus major)
  11. Gracilis minor (rectus internus minor)
  12. Tibialis anticus
  13. Temporalis
  14. Depressor mandibulae
  15. Infraspinatus
  16. Latissimus dorsi
  17. Extensor dorsi communis
  18. Gluteus
  19. Iliofibularis (biceps)
  20. Semimembranosus
  21. Pyriformis
  22. Gastrocnemius
  23. Peroneus
  24. Achilles tendon

Drawn for this site on 2026-10-02 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 muscle is answered.

Next step Next: the bones under these muscles

All 24 muscles on the diagram

Show the list

From below 12

  1. Mylohyoid A flat sheet between the two halves of the lower jaw.
  2. Pectoralis A large fan-shaped chest muscle. Its fibers run together to the upper arm.
  3. Deltoid The muscle on the front of the shoulder. It runs onto the upper arm.
  4. Rectus abdominis A band down the middle of the belly, crossed by tendon lines.
  5. External oblique A thin sheet that covers the side of the body.
  6. Triceps femoris A very large thigh muscle with three heads. It straightens the knee.
  7. Adductor longus A narrow muscle, mostly hidden under the sartorius.
  8. Sartorius A long narrow band that crosses the thigh.
  9. Adductor magnus A large, thick muscle behind the sartorius.
  10. Gracilis major (rectus internus major) A large muscle along the back of the thigh. Older books call it rectus internus major.
  11. Gracilis minor (rectus internus minor) A slender band along the back edge of the thigh.
  12. Tibialis anticus The muscle on the front of the lower leg.

From above 12

  1. Temporalis A jaw muscle between the eye and the eardrum.
  2. Depressor mandibulae A triangle behind the eardrum. It opens the mouth.
  3. Infraspinatus A muscle from the shoulder blade to the upper arm.
  4. Latissimus dorsi A triangle behind the shoulder. Its fibers run together to the upper arm.
  5. Extensor dorsi communis A long muscle along each side of the backbone.
  6. Gluteus A hip muscle from the hip bone to the thigh bone.
  7. Iliofibularis (biceps) A long slender muscle between two big ones. Some books call it the biceps.
  8. Semimembranosus A large, stout muscle on the back of the thigh.
  9. Pyriformis A short, slender muscle at the root of the thigh. It starts at the tip of the urostyle.
  10. Gastrocnemius The calf muscle, the largest of the lower leg.
  11. Peroneus A stout muscle beside the calf muscle. The tibialis anticus lies on its other side.
  12. Achilles tendon The strong tendon of the calf muscle. It passes the ankle to the foot.

How this list was compiled: Every name checked on 2026-10-02 in two sources. A. M. Marshall, The Frog: an Introduction to Anatomy, Histology and Embryology (1894, public domain), the muscular system, https://archive.org/details/frogintroduction01mars. A. Ecker, The Anatomy of the Frog, translated by G. Haslam (1889, public domain), the muscles, https://archive.org/details/anatomyoffrog00ecke. S. J. Holmes, The Biology of the Frog (1906, public domain), the muscular system, https://archive.org/details/biologyoffrog01holm. A. J. Collings and C. T. Richards, PeerJ 2019 (open access), a dissection study of a frog's hind limb, for today's names of the thigh and lower leg muscles, https://europepmc.org/article/PMC/PMC6557250. Licence: own work

The drawing: Drawn for this site on 2026-10-02 from plain geometry; nothing traced. Licence: own work

How it works

This frog muscle quiz shows the muscles a biology class names on a frog. The first view is from below, with the chest, belly and thigh. The second is from above, with the back, hip and calf.

Read the full guide

From below

The mylohyoid lies under the head and the pectoralis fans across the chest. The rectus abdominis runs down the middle of the belly. On the thigh, six muscles lie side by side from the front edge to the back edge: triceps femoris first, gracilis minor last.

From above

The second view is from above. Small jaw muscles sit by the eardrum, and one long muscle follows each side of the backbone. The calf muscle is the gastrocnemius, and it ends in the Achilles tendon. Show me the labels first writes every name on the drawing.

  • Books name some frog muscles differently: gracilis major is also rectus internus major, and the iliofibularis is also the biceps. The quiz accepts both.

Questions and answers

What is the largest muscle in a frog's lower leg?

The gastrocnemius. It is the calf muscle, and it ends in the strong Achilles tendon, which passes the ankle to the foot.

Which muscle opens a frog's mouth?

The depressor mandibulae. It is a triangular muscle just behind the eardrum, and it pulls the back of the lower jaw so that the mouth opens.

What is the triceps femoris of a frog?

It is the very large muscle on the front of the thigh. It starts as three heads and ends in one strong tendon over the knee, and it straightens the leg.

What is the sartorius muscle of a frog?

A long, narrow band on the underside of the thigh. It crosses the thigh at a slant, from the hip to just below the knee.

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