Musculi lumbricales manus

Musculi lumbricales are 4 (I.-IV.). They are numbered from the thumb side of the hand and at the same time lie on the thumb side of the metacarpophalangeal joints.

Beginning:
 * tendons musculus flexor digitorum profundus.

Attachment:
 * the thumb edge of the aponeurosis of individual fingers;
 * base of proximal joints of individual fingers.

Innervation:
 * I., II., sometimes also III. muscle: nervus medianus;
 * III., IV. muscle: nervus ulnaris (ramus profundus).

Function:
 * flexion of the metacarpophalangeal joints;
 * extension of interphalangeal joints;
 * they bow their fingers radially.

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