Scientific BACKGROUND: Palmaris brevis spasm syndrome is a rare and unusual syndrome with contraction and fasciculations of the palmaris brevis (PB) muscle. Etiology has been postulated as repetetive stretch of the superficial branch of the ulnar nerve or possibly radiculopathy. CASE: 20-year-old man complained of spontaneous. irregular. https://pipingrockers.shop/product-category/cats-claw/