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Muscle producing movement of ankel joint short note 3 marks

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I now have excellent source material. Here is a well-structured 3-mark short note:

Muscles Producing Movement at the Ankle Joint

The ankle (talocrural) joint is a hinged synovial joint between the tibia, fibula, and the talus. It primarily allows dorsiflexion and plantarflexion, with limited inversion and eversion contributed by subtalar and tarsal joints. Four muscle groups produce these movements:

1. Dorsiflexion

These muscles run over the anterior aspect of the joint, passing under the extensor retinacula:
  • Tibialis anterior (primary dorsiflexor; also inverts)
  • Extensor hallucis longus
  • Extensor digitorum longus
  • Peroneus tertius (minor contribution)
Innervation: Deep peroneal nerve (L4, L5).

2. Plantarflexion

The primary plantarflexors form the posterior group:
  • Gastrocnemius (via Achilles tendon - powerful plantarflexor during running/jumping)
  • Soleus (via Achilles tendon - sustained standing/posture)
  • Together these form the triceps surae, the dominant plantarflexion unit
  • Assisted by: Tibialis posterior, Flexor digitorum longus, Flexor hallucis longus, Peroneus longus, and Peroneus brevis
Innervation: Tibial nerve (S1, S2).

3. Inversion

  • Tibialis posterior (primary invertor; also plantarflexes)
  • Flexor digitorum longus
  • Flexor hallucis longus
These structures pass posterior to the medial malleolus under the lacinate ligament (tarsal tunnel), remembered by the mnemonic "Tom, Dick, And very Nervous Harry" (Tibialis posterior, flexor Digitorum longus, tibialis posterior Artery + vein, tibial Nerve, flexor Hallucis longus).

4. Eversion

  • Peroneus longus and Peroneus brevis run laterally, posterior to the fibula under the peroneal retinaculum
  • They evert and weakly plantarflex the ankle
  • They are also key stabilizers of the ankle joint against inversion sprains
Innervation: Superficial peroneal nerve (L5, S1).
Mnemonic for dorsiflexors: "The Elderly Have Poorly Trained muscles" (Tibialis anterior, Extensor hallucis longus, Extensor digitorum longus, Peroneus tertius)
Sources: Tintinalli's Emergency Medicine, p. 1113; Rockwood and Green's Fractures in Adults, p. 3109, 3120
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