Trunk Muscles - continued

Main POSTERIOR TRUNK muscles (thoracic and lumbar region):

–  Erector Spinae (sacrospinalis) (consist of iliocostalis,

longissimus, spinalis)

–   Semispinalis (capitis, cervicis, thoracis branches)

–   Deep spinal muscles (multifidi, rotatores,

interspinales, intertransversarii)

[Erector spinae group are MAIN extensors and hyperextensors of the trunk]

Main LATERAL TRUNK muscles (lumbar region):

–   Quadratus Lumborum

–   Psoas Major

[They function bilaterally to flex and unilaterally to laterally flex lumbar spine]

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