What spinal cord levels are involved if a tetraplegic horse can't raise its head?

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Multiple Choice

What spinal cord levels are involved if a tetraplegic horse can't raise its head?

Explanation:
Raising the head depends on motor input from the upper cervical spinal cord and the neck muscles it innervates. If the injury is at the very top of the spinal cord, specifically the C1–C3 region, those motor pathways to the neck muscles are disrupted, so the horse cannot lift its head and presents with tetraplegia. Injuries lower down (like C4–C6, C7–T1, or thoracic levels) would often spare enough neck motor function to allow some head elevation, so they’re less consistent with an inability to raise the head. Therefore, the most likely levels involved when a tetraplegic horse can't raise its head are the upper cervical segments, C1–C3.

Raising the head depends on motor input from the upper cervical spinal cord and the neck muscles it innervates. If the injury is at the very top of the spinal cord, specifically the C1–C3 region, those motor pathways to the neck muscles are disrupted, so the horse cannot lift its head and presents with tetraplegia. Injuries lower down (like C4–C6, C7–T1, or thoracic levels) would often spare enough neck motor function to allow some head elevation, so they’re less consistent with an inability to raise the head. Therefore, the most likely levels involved when a tetraplegic horse can't raise its head are the upper cervical segments, C1–C3.

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