http://en.wikipedia.org/wiki/Pelvis
The medial tract has a "straight" (interspinales, intertransversarii, and spinalis) and an "oblique" (multifidus andsemispinalis) component, both of which stretch between vertebral processes; the former acts similar to the muscles of the lateral tract, while the latter function unilaterally as spine extensors and bilaterally as spine rotators. In the medial tract, the multifidi originates on the sacrum.
The medial tract has a "straight" (interspinales, intertransversarii, and spinalis) and an "oblique" (multifidus andsemispinalis) component, both of which stretch between vertebral processes; the former acts similar to the muscles of the lateral tract, while the latter function unilaterally as spine extensors and bilaterally as spine rotators. In the medial tract, the multifidi originates on the sacrum.
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