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Scalene muscles
The scalene muscles (from Greek σκαληνός, or ''skalenos'', meaning uneven〔Mosby's Medical, Nursing & Allied Health Dictionary, Fourth Edition, Mosby-Year Book Inc., 1994, p. 1395〕 as the pairs are all of differing length) are a group of three pairs of muscles in the lateral neck, namely the anterior scalene, middle scalene, and posterior scalene. They are innervated by the fourth, fifth, and sixth cervical spinal nerves (C4-C6).
A fourth muscle, the scalenus minimus (Sibson's muscle), is sometimes present behind the lower portion of the anterior scalene.〔
==Origin and insertion==
The scalene muscles originate from the transverse processes from the cervical vertebrae of C2 to C7 and insert onto the first and second ribs, and used to be known as the ''lateral vertebral muscles''.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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