
a deep muscle of the back; it arises from a tendon attached to the crest along the centre of the sacrum (the part of the backbone at the level of ... [1 related articles]
Found on
http://www.britannica.com/eb/a-z/e/40
(muscles) Type: Term Definitions: 1. proper muscles of back; origin, from sacrum, ilium, and spines of lumbar vertebrae; it divides into three columns, iliocostalis musculus, longissimus musculus, and spinalis musculus, which insert into ribs and vertebrae with additional muscle slips joining the columns at successively higher le...
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http://www.medilexicon.com/medicaldictionary.php?t=56721

The erector spinae, or sacrospinalis, consists of several combined muscles which form a thick, elongated muscle mass that runs from the top of the neck to the small of the back. The overlapping column of long, slim muscles stretch alongside to the rear of the vertebrae. They are innervated by posterior branches of the spinal nerves. These muscles l...
Found on
http://www.probertencyclopaedia.com/browse/EE.HTM
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