Lesson
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]