trunk muscle actions

Trunk extensors

Erector spinal group, transvserospinalis, quadratus lumborum, latissimus dorsi

Trunk flexors

Rectus abdominus, external oblique, internal oblique, transverse abdominus, iliopsoas

Trunk lateral flexors

Erector spinae, transvsersospinalis, quadratus lumborum, latissimus dorsi, Rectus abdominus, external oblique, internal oblique, transverse abdominus, iliopsoas

Trunk rotators

External oblique, internal oblique, multifidi, rotatores

Neck extensors

Erector spinae, transvsersospinalis, splenius capitis, splenius cervics, interspinalis, upper trapezius, subocciputals, levator scapula

Neck and head flexors

Sternocleidomastoid, anterior scalenes, deep flexors

Neck lateral flexors

Scalenes, intertransversarii, sternocleidomastoid, deep flexors, erector spinae, transversospinalis, splenius capitis, splenius cervics, interspinalis, upper trapezius, suboccipitals, levator scapula

Neck left rotators

Right sternocleidomastoid, right scalenes, left deep neck flexors, left and right erector spinae, right transversospinalis, left splenius capitis, left splenius cervics, right upper trapezius, left suboccipitals, left levator scapula

Right neck rotators

Left sternocleidomastoid, left scalenes, right deep neck flexors, left and right erector spinae, left transversospinalis, right splenis capitis, right splenis cervicis, left upper trapezius, right levator scapula, right suboccipitals