Which of the following cords are associated with Erb’s Palsy?
**Erb's Palsy and Brachial Plexus Injury**
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**Core Concept**
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Erb's Palsy is a form of brachial plexus injury that occurs due to trauma, typically during childbirth, affecting the upper roots of the brachial plexus (C5-C6). This injury disrupts the nerve supply to the muscles of the upper arm, leading to weakness or paralysis of the affected limb.
**Why the Correct Answer is Right**
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The injury to the brachial plexus in Erb's Palsy primarily affects the C5 and C6 nerve roots, which innervate the muscles responsible for shoulder abduction and elbow flexion. The involvement of these nerve roots leads to characteristic symptoms such as drooping of the shoulder, weakness of the arm, and loss of sensation on the lateral aspect of the arm. The C5 and C6 nerve roots are specifically associated with Erb's Palsy due to their anatomical location and the mechanism of injury.
**Why Each Wrong Option is Incorrect**
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* **Option A:** C7 - While C7 is involved in some cases of brachial plexus injury, it is not specifically associated with Erb's Palsy.
* **Option B:** C8 - C8 is not typically involved in Erb's Palsy, as the injury primarily affects the upper roots of the brachial plexus.
* **Option D:** T1 - T1 is not associated with Erb's Palsy, as the injury primarily affects the upper roots of the brachial plexus.
**Clinical Pearl / High-Yield Fact**
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A key clinical feature of Erb's Palsy is the "waiter's tip" deformity, where the arm is adducted and internally rotated, resembling a waiter's tip. This deformity is due to the weakness of the supraspinatus and deltoid muscles.
**Correct Answer: C. C5 and C6**