Human Anatomy: Muscle Groups

Human Anatomy

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Muscle Function & Other Pertinent Medical Information
ORIGIN: Anteriorshafts of 1, 2, 4, 5 metacarpals (unipennate)
INSERTION: Proximal phalanges and dorsal extensor expansion on ulnar side of index and radial side of ring and little fingers and to ulnar sesamoid of thumb
ACTION: Adduct to axis of middle finger. Flex metacarpophalangeal joint while extending interphalangeal joints
NERVE: Deep branch of ulnar nerve (T1)

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