Lumbrical muscle (foot)

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Lumbrical muscle of the foot
Muscles of the sole of the foot. Second layer. (Lumbricals visible at bottom.)
Latin	musculus lumbricalis pedis
Gray's	subject #131 493
Origin	Medial borders of long flexor tendons
Insertion	Proximal phalanges and extensor tendons of the 4 lateral toes
Artery:	Medial and Lateral plantar arteries
Nerve:	medial and lateral plantar nerves (S3)
Action:	Flexes meteatarsalpharangeal joints, extends distal interpharangeal and proximal interpharangeal
Dorlands /Elsevier	m_22/12549758

For the muscle of the hand, see Lumbrical muscle (hand).

The Lumbricales are four small muscles, accessory to the tendons of the Flexor digitorum longus and numbered from the medial side of the foot; they arise from these tendons, as far back as their angles of division, each springing from two tendons, except the first.

The muscles end in tendons, which pass forward on the medial sides of the four lesser toes, and are inserted into the expansions of the tendons of the Extensor digitorum longus on the dorsal surfaces of the first phalanges. All four lumbricals insert into extensor hoods of the phalanges, thus creating extension at the inter-phalangeal joints. However as the tendons also pass inferior to the metatarsal phalangeal joints it creates flexion at this joint.

[edit] Variations

Absence of one or more; doubling of the third or fourth even the fifth . Insertion partly or wholly into the first phalanges.

[edit] Innervation

The most medial lumbrical is innervated by the medial plantar nerve while the remaining three lumbricals are supplied by the lateral plantar nerve.

[edit] External links

• LUC lumf
• -1966079920 at GPnotebook
• lumbricals+%28lumbrical+muscles%29+of+foot at eMedicine Dictionary
• PTCentral

This article was originally based on an entry from a public domain edition of Gray's Anatomy. As such, some of the information contained herein may be outdated. Please edit the article if this is the case, and feel free to remove this notice when it is no longer relevant.

v • d • e List of muscles of lower limbs ILIAC Region / ILIOPSOAS psoas major/psoas minor - iliacus BUTTOCKS gluteals: (maximus, medius, minimus) - tensor fasciae latae lateral rotator group: piriformis - inferior gemellus - obturator internus - superior gemellus - quadratus femoris THIGH anterior compartment: sartorius - quadriceps (rectus femoris, vastus lateralis, vastus intermedius, vastus medialis) - articularis genu posterior compartment/hamstring: biceps femoris - semitendinosus - semimembranosus medial compartment: pectineus - obturator externus - gracilis - adductor (longus, brevis, magnus) LEG anterior compartment: tibialis anterior - extensor hallucis longus - extensor digitorum longus - peroneus tertius posterior compartment: superficial - calf/triceps surae (gastrocnemius, soleus) - plantaris posterior compartment: deep - tarsal tunnel (flexor hallucis longus, flexor digitorum longus, tibialis posterior) - popliteus lateral compartment: peroneus muscles (longus, brevis) FOOT dorsal - extensor hallucis brevis - extensor digitorum brevis plantar - 1st layer (abductor hallucis, flexor digitorum brevis, abductor digiti minimi) plantar - 2nd layer (quadratus plantae, lumbrical muscle) plantar - 3rd layer (flexor hallucis brevis, adductor hallucis, flexor digiti minimi brevis) plantar - 4th layer (dorsal interossei, plantar interossei)