Calves (Gastrocnemius and Soleus)
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The calf comprises the gastrocnemius (crosses knee and ankle) and the soleus (crosses only the ankle); both plantar-flex the foot.
Detail
The calf is made up of two muscles. The gastrocnemius, which is the larger, higher, and thicker of the two, crosses both the knee and the ankle joint, while the soleus crosses only the ankle. Plantar flexion of the foot is 45 degrees; dorsiflexion of the foot is 10–15 degrees. The gastrocnemius has 2 heads, and one head can be emphasized over the other (per source: yes). For the standing calf raise, do not bend the knees to help out with movement and do not lock out the knees. For the donkey calf, ensure a vertical motion (not pivoting around the axis) and keep the ball of the feet on the foot plate.
Key facts
- Two muscles: gastrocnemius (crosses knee + ankle) and soleus (crosses only the ankle).
- Gastrocnemius is the larger, higher, thicker muscle, with 2 heads.
- Plantar flexion ROM: 45°; dorsiflexion ROM: 10–15°.
- Standing calf: don't bend or lock the knees; donkey calf: vertical motion, ball of feet on plate.
Connections
- Gastrocnemius — 2-head, 2-joint calf muscle.
- Soleus — single-joint calf muscle.
- Plantar Flexion — the movement they produce.
- Antigravity Musculature — ankle antigravity muscles.
Sources
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Educational content only — not medical advice. Always consult a qualified professional for individualized guidance, especially around injury, pregnancy, or medical conditions.