What is Klumpke’s Paralysis?

Brachial plexus. Klumpke’s paralysis primarily affects C8 and T1.

Paralysis of the lower arm, with wasting of the small muscles in the hand, and numbness of the fingers (but not the thumb) and the inner forearm.

Klumpke’s paralysis is caused by injury to the eighth cervical and first thoracic nerves (two of the spinal nerves) in the brachial plexus (the network of nerves located behind the shoulder blade), which usually results from injury to the shoulder.