In the middle line is the "'median sacral crest "', surmounted by three or four laminae of the corresponding vertebrae.
2.
On the lateral aspect of the sacral groove is a linear series of tubercles produced by the fusion of the articular processes which together form the indistinct "'medial sacral crest " '.
3.
The origins for the erector spinae muscle group are the nuchal ligament at the base of the back of the skull, ribs 3-12, thoracic and lumbar vertebrae, the thoracolumbar fascia, and the median and lateral sacral crests.
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