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Ankle Dorsiflexion Anatomy and Function

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Questions and Answers

Which muscle is considered the primary muscle involved in ankle dorsiflexion?

Soleus
Tibialis Anterior (correct)
Extensor Digitorum Longus
Extensor Hallucis Longus

What is the normal range of motion for ankle dorsiflexion?

0 to 20 degrees (correct)
0 to 25 degrees
0 to 10 degrees
0 to 15 degrees

What is one effect of weakness in the tibialis anterior muscle?

Enhanced ability to walk on heels
Increased plantarflexion
Decreased dorsiflexion and foot eversion (correct)
Increased inversion of the foot

Which of the following muscles can substitute for a weak tibialis anterior muscle during dorsiflexion?

<p>Extensor Hallucis Longus (C)</p> Signup and view all the answers

What limits the range of motion during ankle dorsiflexion?

<p>Tension of the calf muscle (C)</p> Signup and view all the answers

Flashcards

Primary Ankle Dorsiflexors

The main muscles responsible for bending the foot upward at the ankle. These include Tibialis Anterior, Extensor Digitorum Longus, and Extensor Hallucis Longus.

Ankle Dorsiflexion ROM

The range of movement of ankle dorsiflexion is 0 to 20 degrees.

Tibialis Anterior Function

The tibialis anterior muscle extends and inverts the foot aiding in dorsiflexion, and also holds the arch of the foot.

Weakness in Dorsiflexion

Weakness in dorsiflexion can lead to difficulty in bending the foot upward, potentially favouring a foot turning outward.

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Substitution Muscles

When a muscle is weak, other muscles can take over its function. This is common for dorsiflexion.

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Study Notes

Ankle Dorsiflexion

Primary Muscles: Tibialis Anterior, Extensor Hallucis Longus, Extensor Digitorum Longus
Range of Motion: 0 to 20 degrees
Factors Limiting Motion: Calf muscle tension
Tibialis Anterior Muscle:
- Origin: Upper half of lateral tibia and interosseous membrane
- Insertion: Inferomedial aspect of medial cuneiform and base of 1st metatarsal
- Action: Extends and inverts the foot at the ankle, supports the medial longitudinal arch
Nerve Supply: Deep peroneal nerve
Weakness Effects: Weakness in tibialis anterior reduces dorsiflexion ability, potentially causing foot eversion
Substitution Muscles: Extensor hallucis longus can compensate for weak tibialis anterior, assisting in dorsiflexion with inversion.

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Description

Explore the anatomy and functional aspects of ankle dorsiflexion, including the primary muscles involved, their origins, insertions, and actions. This quiz covers the range of motion, factors limiting movement, and effects of weakness in the tibialis anterior. Test your knowledge on the compensation mechanisms that occur during dorsiflexion.