Posterior aspect of left ankle and foot

Peroneus accessorius muscle; long flexor tendons in relation to ankle, posterior view

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Image #199-4

Posterior aspect of left ankle and foot

Peroneus accessorius muscle; long flexor tendons in relation to ankle, posterior view

The peroneus longus and brevis muscles have been cut off. A peroneus accessorius muscle (7) is present with a small muscular portion attached to the lateral side of the calcaneus and a slender tendon extending upward to blend with the posterior intermuscular septum of the leg. The calcaneal tendon has been divided slightly above its attachment of the calcaneus.

1. Fibula
2. Posterior intermuscular septum
3. Tendon of accessory peroneus muscle
4. Superior peroneal retinaculum (divided)
5. Groove for peroneal tendons
6. Calcaneal branch of peroneal artery
7. Accessory peroneus muscle
8. Tendo calcaneus
9. Rete calcaneum
10. Peroneus longus muscle (tendon, cut off)
11. Tuberosity of calcaneus
12. Flexor hallucis longus muscle
13. Posterior tibial artery
14. Calcaneal branch of the posterior tibial artery
15. Tibial nerve (pointer on medial plantar nerve, cut off)
16. Lateral plantar nerve
17. Flexor retinaculum (opened to expose tendons)
18. Flexor hallucis longus muscle (tendon)
19. Flexor digitorum longus muscle (tendon)
20. Tibialis posterior muscle (tendon)
21. Flexor hallucis brevis muscle