The absence of which reflex distinguishes total brachial plexus palsy from Erb's palsy?

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Multiple Choice

The absence of which reflex distinguishes total brachial plexus palsy from Erb's palsy?

Explanation:
The distinguishing feature is the palmar grasp reflex, which depends on the lower nerve roots (C8–T1). In Erb’s palsy the injury is to the upper trunk (C5–C6), so the lower trunk is spared and the palmar grasp reflex is usually present. In total brachial plexus palsy, the entire plexus including C8–T1 is affected, so the hand muscles can’t respond to palm stimulation and the grasp reflex is absent. The Moro reflex involves the upper roots and can be diminished in Erb’s as well, but it’s not as definitive for distinguishing the extent of injury.

The distinguishing feature is the palmar grasp reflex, which depends on the lower nerve roots (C8–T1). In Erb’s palsy the injury is to the upper trunk (C5–C6), so the lower trunk is spared and the palmar grasp reflex is usually present. In total brachial plexus palsy, the entire plexus including C8–T1 is affected, so the hand muscles can’t respond to palm stimulation and the grasp reflex is absent. The Moro reflex involves the upper roots and can be diminished in Erb’s as well, but it’s not as definitive for distinguishing the extent of injury.

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