<Tr> <Th> Origin </Th> <Td> Medial borders of long flexor tendons </Td> </Tr> <Tr> <Th> Insertion </Th> <Td> Proximal phalanges and extensor tendons of the 4 lateral toes </Td> </Tr> <Tr> <Th> Artery </Th> <Td> Medial and Lateral plantar arteries </Td> </Tr> <Tr> <Th> Nerve </Th> <Td> medial and lateral plantar nerves (S3) </Td> </Tr>

The lumbricals form the 2nd layer of the plantar foot muscles