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beginnerSource-checked11 min read

The Lower Legs: An Overview

The calf, shin, and outer-leg muscles that move the ankle and absorb impact with every step.

Before this: The Knee: An Overview

You will be able to

  • Name the lower leg's main muscle groups and their primary actions.
  • Explain the difference between the gastrocnemius and soleus.
  • Describe the tibialis anterior's role as the dorsiflexion counterpart to the calf muscles.
Simplified side view of the lower leg showing the rounded gastrocnemius and deeper soleus forming the calf at the back, and the tibialis anterior running along the front of the shin down to the foot.
Lower leg — gastrocnemius, soleus, and tibialis anterior (simplified). A beginner-level schematic of the lower leg's calf (gastrocnemius, soleus) and shin (tibialis anterior) muscles.
Illustration: Anatomy Learning Platform (original) · CC0-1.0 (public domain dedication)

⚠ Safety note

Sudden sharp calf pain, an audible pop, or inability to rise onto the toes needs prompt medical evaluation — possible signs of a significant strain or Achilles tendon injury. A trainer coaches calf/shin strengthening technique; they do not diagnose tendon injuries.

Three groups, one job: controlling the ankle

The lower leg has three functional muscle groups, all acting on the ankle joint:

  • Calf muscles (back): the gastrocnemius and soleus point the foot down (plantarflexion),

sharing the Achilles tendon.

  • Shin muscle (front): the tibialis anterior lifts the foot up (dorsiflexion) — the opposing

action to the calf muscles.

  • Outer muscles (side): the fibularis longus rolls the foot outward (eversion) and helps

stabilize the ankle.

Two calf muscles, two knee positions

The gastrocnemius crosses both the knee and ankle, while the soleus crosses only the ankle. That single difference is why standing (straight-knee) calf raises emphasize the gastrocnemius, while seated (bent-knee) calf raises emphasize the soleus.

The neglected shin muscle

Because the calf gets most of the training attention, the tibialis anterior is often under-trained despite its important role in controlling the foot right after it strikes the ground during walking and running.

Sources for this lesson

“The gastrocnemius and soleus plantarflex the ankle, and the tibialis anterior dorsiflexes it.”

Anatomy and Physiology 2e — OpenStax, Rice University · Ch. 11.6 Appendicular Muscles of the Pelvic Girdle and Lower Limbs

Peer-reviewed textbook · License: CC BY-NC-SA 4.0 · Last checked 2026-07-19

Take the quiz (3 questions)Explore the Lower Legs

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