Podcast
Questions and Answers
Which muscles are primarily involved in ankle eversion from plantar flexion?
Which muscles are primarily involved in ankle eversion from plantar flexion?
What is the range of motion for ankle eversion from plantar flexion?
What is the range of motion for ankle eversion from plantar flexion?
What is the effect of weakness in ankle eversion from plantar flexion?
What is the effect of weakness in ankle eversion from plantar flexion?
Which nerve innervates the Peroneus longus and Peroneus brevis muscles?
Which nerve innervates the Peroneus longus and Peroneus brevis muscles?
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One of the following is an accessory muscle involved in ankle eversion. Which one is it?
One of the following is an accessory muscle involved in ankle eversion. Which one is it?
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What is a characteristic action of the Peroneus longus muscle?
What is a characteristic action of the Peroneus longus muscle?
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What will likely occur due to a contracture of ankle eversion from plantar flexion?
What will likely occur due to a contracture of ankle eversion from plantar flexion?
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From where does the Peroneus brevis muscle originate?
From where does the Peroneus brevis muscle originate?
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Study Notes
Ankle Eversion from Plantar Flexion
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Primary Muscles:
- Peroneus longus
- Peroneus brevis
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Accessory Muscles:
- Extensor digitorum longus
- Peroneus tertius
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Range of Motion:
- 15° to 25° of foot eversion
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Peroneus Longus Anatomy:
- Origin: Lateral condyle of tibia, head of fibula, upper two-thirds of lateral fibula shaft
- Insertion: Base of 1st metatarsal and medial cuneiform
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Action of Peroneus Longus:
- Plantar flexes and everts foot
- Supports lateral longitudinal and transverse arches
- Innervated by the peroneal nerve
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Peroneus Brevis Anatomy:
- Origin: Lower two-thirds of lateral fibula shaft
- Insertion: Base of 5th metatarsal
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Action of Peroneus Brevis:
- Plantar flexes and everts foot
- Supports lateral longitudinal arches
- Innervated by the peroneal nerve
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Weakness Effects:
- Decreases strength of eversion/plantar flexion of ankle
- Allows a varus position of the foot
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Contracture Effects:
- Results in an everted or valgus foot position
- Lessens ability to rise on toes
- Decreases lateral foot stability
Objectives
- Identify primary muscles of ankle eversion from plantar flexion
- Identify range of motion of ankle eversion from plantar flexion
- Describe effect of weakness of ankle eversion
- Describe effect of ankle eversion contracture
Additional Information
- Figure 1: Diagram of the Peroneus Longus muscle, includes origin, insertion, and pathway
- Figure 2: Diagram of the Peroneus Brevis muscle, includes origin, insertion, and pathway
- Figure 3: Diagram of everted/valgus foot, showing extreme position of the medial malleolus and bowing of the Achilles tendon. Illustrates neutral, everted, and inverted positions
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