Accessory soleus muscle

Dr Henry Knipe and Dr Bruno Di Muzio et al.

The accessory soleus muscle is an anatomical variant characterised by an additional distinct muscle encountered along a normal soleus muscle. It is uncommon with a prevalence of ~3% (range 0.7-5.5%).

  • origin: fibula, soleal line of the tibia, or the anterior surface of the soleus muscle
  • insertion:  calcaneus, at either the upper surface or the medial cortex
    • into the Achilles tendon distally
    • fleshy insertion into the upper surface of the calcaneus
    • fleshy insertion into the medial cortex of the calcaneus
    • tendinous insertion into the upper calcaneal surface
    • tendinous insertion into the medial surface of the calcaneus
  • arterial supplyposterior tibial artery
  • innervationtibial nerve

The accessory soleus muscle arises from the deep surface of the soleus or from the fibula and descends anteriorly to the calcaneal (Achilles) tendon. Its insertion may occur into the calcaneal tendon, the upper surface of the calcaneus, or in the medial aspect of the calcaneus.

The Kager fat pad is obliterated by a well-defined area of increased soft-tissue attenuation. 

Associated exertional pain can occur, especially in athletes 1

Lower limb anatomy
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Article information

rID: 48876
Section: Anatomy
Tag: cases
Synonyms or Alternate Spellings:

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