Everyday Muscle.

Lumbricals (Hand)

Hand
Named after earthworms (lumbricus) because of their shape. Unique because they originate from tendons, not bone.
Function
Flex MCP joints while extending IP joints
Origin
Tendons of flexor digitorum profundus
Insertion
Lateral bands of extensor expansions of digits 2-5
Innervation
Lateral two: median nerve; Medial two: ulnar nerve
Learn this region Quiz this region
Flexor Digitorum Profundus Extensor Digitorum Extensor Indicis Flexor Pollicis Longus Extensor Pollicis Longus Extensor Pollicis Brevis Abductor Pollicis Longus Adductor Pollicis Opponens Pollicis Opponens Digiti Minimi (Hand)