Short Muscles of Hand

Lumbricals 1,2 origins

Lateral 2 tendons of FDP

Lumbricals 1,2 insertions

Lateral sides of extensor expansions 2-3

Lumbricals 1,2 innervation

Median nerve

Lumbricals 1,2 action

Flex MCP joint, extend IP joints 2,3

Lumbricals 3,4 origins

Medial 3 tendons of FDP

Lumbricals 3,4 insertions

Lateral sides of extensor expansions 4,5

Lumbricals 3,4 innervation

Ulnar nerve

Lumbricals 3,4 action

Flex MCP joints, extend IP joints 4,5

Dorsal interossei 1-4 origin

Adjacent sides of two metacarpals

Dorsal interossei insertion

Bases of prox phalanges, extensor expansions 2-4

Dorsal interossei innervation

Ulnar nerve

Dorsal interossei action

Abduct digits 2,4,5 towards axial line

Palmar interossei 1-3 origin

Palmar surfaces of metacarpals 2,4,5

Palmar interossei insertions

Bases of prox phalanges, extensor expansions of digits 2,4,5

Palmar interossei innervation

Ulnar nerve

Palmar interossei action

Adduct digits 2,4,5 towards axial line of digit 3