PHTY100 Lecture Notes - Lecture 7: Triceps Surae Muscle, Toe, Navicular Bone
7.1 Identify, list attachments and deduce the action(s) of the muscles of the leg:
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Behind the malleoli - plantarflexion
In front of the malleoli - dorsiflexion
Lateral to AP axis of foot - eversion
Medial to AP axis of foot - inversion
Location of tendon at the ankle is a quick reliable way to begin determining action
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Comes in medially under the foot
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Works with tibialis posterior to invert, synergise each other to prevent
flexion and extension
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Tibialis anterior
Extensor hallucis longus
Extensor digitorum longus
Peroneus tertius
Anterior group (dorsiflexors)
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7. Muscles of the Thigh and Leg
Wednesday, 5 April 2017
3:29 PM
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Pulls off the lateral surface of the fibula (top half)
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Peroneus longus
Pulls of the lateral surface of the tibia (bottom half)
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Peroneus brevis
Lateral group (evertors)
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Contribute to knee flexion
When knee is straight stretch is on gastrocnemius
Gastrocnemius
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Doesn’t cross the knee
When knee is bent stretch is on soleus
Referred to as triceps surae with gastrocnemius and form Achilles
tendon
Soleus
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Vestigial muscle - gradually evolving out of humans
Plantaris
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Superficial
Posterior group
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Doesn't attach at the ankle
Popliteus
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Tibialis posterior
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Deep
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Sits really deep in between the tibia and fibula, pulling off the
interosseous membrane
Behind the malleoli, under navicular and cuneiform
Tibialis posterior
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Contribute to plantarflexion
Flexor digitorum longus
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Hallucis = of the great toe
Contribute to plantarflexion
Flexor hallucis longus
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Wrap around medial malleolus (T, D, H in order)
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Document Summary
7. 1 identify, list attachments and deduce the action(s) of the muscles of the leg: Location of tendon at the ankle is a quick reliable way to begin determining action. Lateral to ap axis of foot - eversion. Medial to ap axis of foot - inversion. Works with tibialis posterior to invert, synergise each other to prevent flexion and extension. Pulls off the lateral surface of the fibula (top half) Pulls of the lateral surface of the tibia (bottom half) When knee is straight stretch is on gastrocnemius. When knee is bent stretch is on soleus. Referred to as triceps surae with gastrocnemius and form achilles tendon. Vestigial muscle - gradually evolving out of humans. Sits really deep in between the tibia and fibula, pulling off the interosseous membrane. Wrap around medial malleolus (t, d, h in order) 7. 2 identify and / or describe the location of the following features and state their specific mechanical function:
