The four lumbrical muscles arise from the tendons of flexor digitorum profundus. They have different origins:
Each passes distally to the radial side of its nearest metacarpophalangeal joint of the fingers to be inserted into the dorsal extensor expansion of digits two to five.
Their actions on these digits are to:
The innervation of the lumbricals is dual:
Occasionally, the third lumbrical can receive its innervation from the median nerve.
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