Ankle dorsiflexion is present in which motor level?

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Multiple Choice

Ankle dorsiflexion is present in which motor level?

Explanation:
Ankle dorsiflexion is driven mainly by the tibialis anterior, which is innervated by the L4 nerve root. In motor level testing, the most caudal key muscle that shows at least some strength determines the motor level. Since dorsiflexion is present, the motor level sits at L4. Lower levels like T12 or L2 wouldn’t produce dorsiflexion, and S1 is mainly responsible for plantarflexion. A quick map helps: hip flexion is around L2, knee extension around L3, ankle dorsiflexion around L4, great toe dorsiflexion around L5, and plantarflexion around S1. So the motor level corresponding to ankle dorsiflexion is L4.

Ankle dorsiflexion is driven mainly by the tibialis anterior, which is innervated by the L4 nerve root. In motor level testing, the most caudal key muscle that shows at least some strength determines the motor level. Since dorsiflexion is present, the motor level sits at L4. Lower levels like T12 or L2 wouldn’t produce dorsiflexion, and S1 is mainly responsible for plantarflexion. A quick map helps: hip flexion is around L2, knee extension around L3, ankle dorsiflexion around L4, great toe dorsiflexion around L5, and plantarflexion around S1. So the motor level corresponding to ankle dorsiflexion is L4.

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