The hypothenar eminence is formed by three intrinsic muscles, with palmaris brevis lying superficially outside the compartment. All four muscles in this region are innervated by the ulnar nerve (C8, T1). • Abductor digiti minimi – deep branch of ulnar nerve • Flexor digiti minimi brevis – deep branch of ulnar nerve • Opponens digiti minimi – deep branch of ulnar nerve • Palmaris brevis – superficial branch of ulnar nerve Together, the hypothenar muscles enable small finger motion, cupping of the