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
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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