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Lumbar

/ˈləmbər/  /-ˌbär/ Adjective Related to the lower back or loin (wiktionary.org); of or relating to or near the part of the back between the ribs and the hipbones (wordnetweb.princeton.edu); pertaining to the loins, the part of the back between the thorax and the pelvis. (biology-online.org) Word origin: From Modern Latin lumbaris, from Latin lumbus...

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Lumbrical

Worm-like. As in the lumbrical muscles of the forearm or the round worm Ascaris lumbricoides. (wiktionary.org) Word origin: From Latin lumbricus, “worm.”

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Lumbricals of the foot

Four small skeletal 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 proximal phalanges. All four lumbricals insert into extensor hoods of the phalanges, thus creating extension at the inter-phalangeal (PIP and DIP) joints. However as the tendons also pass inferior to the metatarsal phalangeal (MTP) joints it creates flexion at this joint....

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Lumbricals of the hand

These are four intrinsic small, worm-like muscles on each hand that flex the metacarpophalangeal joints and extend the interphalangeal joints. These muscles are unusual in that they do not attach to bone. Instead they attach proximally to the tendons of flexor digitorum profundus and distally to the extensor expansions....

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