scalenus

noun
sca·​le·​nus | \ skā-ˈlē-nəs How to pronounce scalenus (audio) \
plural scaleni\ -​ˌnī How to pronounce scaleni (audio) \

Medical Definition of scalenus

: any of usually three deeply situated muscles on each side of the neck of which each extends from the transverse processes of two or more cervical vertebrae to the first or second rib:
a : one arising from the transverse processes of the third to sixth cervical vertebrae, inserting on the scalene tubercle of the first rib, and functioning to bend the neck forward and laterally and to rotate it to the side

called also anterior scalene, scalenus anterior, scalenus anticus

b : one arising from the transverse processes of the lower six cervical vertebrae, inserting on the upper surface of the first rib, and functioning similarly to the scalenus anterior

called also middle scalene, scalenus medius

c : one arising from the transverse processes of the fourth to sixth cervical vertebrae, inserting on the outer surface of the second rib, and functioning to raise the second rib and to bend and slightly rotate the neck

called also posterior scalene, scalenus posterior

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