Lumbricals
Lumbricals are located both in the hands and foot.
Lumbricals of hand[edit | edit source]
The lumbricals of the hand are muscles that flex the metacarpophalangeal joints and extend the interphalangeal joints.
Origin[edit | edit source]
They attach proximally to the tendons of flexor digitorum profundus,
Blood supply[edit | edit source]
Four separate sources supply blood to these muscles: the superficial palmar arch, the common palmar digital artery, the deep palmar arch, and the dorsal digital artery.
Nerve supply[edit | edit source]
The first and second lumbricals (the most radial two) are innervated by the median nerve. The third and fourth lumbricals (most ulnar two) are innervated by the ulnar nerve.
The lumbrical muscles, with the help of the interosseous muscles, simultaneously flex the metacarpophalangeal joints while extending both interphalangeal joints of the digit on which it inserts.
The lumbricals are used during an upstroke in writing.
Tendons of forefinger and vincula tendina
Lumbricals of the hand
Lumbricals of the hand
Lumbricals muscle
Lumbricals muscle
Lumbricals muscle
Lumbricals muscle
Lumbricals muscle
Muscles of hand, cross section
Wrist joint. Deep dissection.Anterior, palmar view
Wrist joint. Deep dissection.Anterior, palmar view
Wrist joint. Deep dissection.Anterior, palmar view
Lumbricals of the foot[edit | edit source]
The lumbricals in the foot skeletal muscles located in the deeper layers of the foot - there are a total of about 4 of them in each foot.
These muscles are accessory to the tendons of the flexor digitorum longus muscle. They are numbered from the medial side of the foot.
Origin[edit | edit source]
They originate at the tendons of flexor digitorum longus in the foot
Insertion[edit | edit source]
medial surface of extensor expansion of proximal phalanges of lateral four toes
Blood supply[edit | edit source]
lateral plantar artery, plantar arch, four plantar metatarsal arteries
Nerve supply[edit | edit source]
lateral plantar nerve (lateral three lumbricals) and medial plantar nerve (first lumbrical)
Function[edit | edit source]
They help maintain extension of digits at interphalangeal joints
Additional images[edit | edit source]
Tendons of forefinger and vincula tendina
Lumbricals of the hand
Lumbricals of the hand
Lumbricals muscle
Lumbricals muscle
Lumbricals muscle
Lumbricals muscle
Lumbricals muscle
Muscles of hand, cross section
Wrist joint. Deep dissection.Anterior, palmar view
Wrist joint. Deep dissection.Anterior, palmar view
Wrist joint. Deep dissection.Anterior, palmar view
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Portions of content adapted from Wikipedia's article on Lumbricals which is released under the CC BY-SA 3.0.
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Contributors: Prab R. Tumpati, MD
