Wormlike muscles
Wormlike muscles , mm. Lumbricales, number four, look like small spindle-shaped muscles. Each of them begins from the ray margin of the corresponding tendon m. Flexoris digitorum profundus and is attached to the back surface of the base of the proximal phalanges from the index finger to the little finger. Here they are weaved into the dorsal aponeurosis of the index, middle, ring finger and little finger from the side of their radial edge, skirting the heads of metacarpal bones.
Function: bend the proximal phalanges of the four fingers and straighten the middle and distal phalanges of the same fingers.
Innervation: the first and second are n. Medianus; The third and fourth are n. Ulnaris (CVIII-ThI).
Blood supply: arcus palmaris superficialis et profundus.
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