As it crosses the deep part of the hand, it innervates all the interosseous muscles and the third and fourthlumbricals.
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Beneficial exercise will be any that strengthens the interosseous muscles andlumbricals.
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Exercises to strengthenlumbricals, strengthen flexion in the metacarpophalangeal joint, and extension in the interphalangeal joints are beneficial.
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Thelumbricalsattach in part to the flexor digitorum profundus tendons.
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As the wrist flexes, the flexor digitorum profundus contracts in a proximal direction, drawing thelumbricalsalong with it.
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In some individuals, thelumbricalscan be dragged into the carpal tunnel with flexor digitorum profundus contraction.
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They also provide motor innervation to quadratus plantae, abductor digiti minimi, flexor digiti minimi brevis, lateral threelumbricals, adductor hallucis, and the dorsal and plantar interossei.
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