Klumpke's Palsy primarily affects which spinal nerves?

Klumpke's Palsy is a type of brachial plexus injury that specifically results from damage to the lower roots of the brachial plexus, primarily involving the C8 and T1 spinal nerves. This condition typically occurs due to excessive lateral traction on the arm during delivery or other trauma that affects the shoulder, leading to weakness or paralysis of the muscles innervated by these nerves.

The C8 and T1 nerves are responsible for the innervation of the intrinsic muscles of the hand and the medial aspect of the forearm. Thus, when these nerves are compromised, it leads to characteristic symptoms of Klumpke's Palsy, which include a "claw hand" appearance due to the inability to flex the fingers and an absence of normal hand function.

Understanding this pathophysiology highlights the reason why the involvement of the C8 and T1 nerves is crucial for diagnosing and managing Klumpke's Palsy. The other options include nerves that do not correspond to the roots primarily affected in this specific condition, making them less relevant in this context.