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MSM Muscles: Back

Origin, Insertion, Action, Innervation

MuscleOriginInsertionActionInnervation
Trapezius Superior nuchal line, C1-T12 Spine of scapula, acromion, clavicle adduction, elevation, rotation, depression of scapula accesory nerve
Latissimus dorsi T5-T12, thoracodorsal fascia, iliac crest, ribs 9-12 bicipital groove of humerus adduction, extension, rotation of arm medially thoracodorsal nerve
Rhomboid major spine T2-T5 spine of scapula adduct scapula dorsal scapular
Rhomboid minor spine C7-T1 root of spine of scapula adduct scapula dorsal scapular, C5
Levator scapulae trans process C1-C4 medial border of scapula elevates scapula dorsal scapular, C3, C4
Serratus posterior superior ligamentum nuchae, supraspinal ligament, C7-T3 upper border of ribs T2-T5 elevates ribs intercostal T1-T4
Serratus posterior inferior supraspinal ligament, T11-L3 lower border of ribs 2-5 depresses ribs intercostal T9-T12
Iliocostalis lumborum iliac crest (hip) ribs 6-12 extension & lateral bending of vertebral column primary dorsal rami
Iliocostalis thoracis ribs 6-12 ribs 1-6, transverse process C7 extension & lateral bending of vertebral column primary dorsal rami
Iliocostalis cervicis ribs 3-6 transverse processes C4-C6 extension & lateral bending of vertebral column primary dorsal rami
Longissimus thoracis iliac crest (hip) transverse processes T1-T12, ribs 9-10 rotation, extension vertebral column primary dorsal rami
Longissimus cervicis transverse processes T1-T5 transverse & articular processes C2-C6 rotation, extension head & neck primary dorsal rami
Longissimus capitis transverse processes T1-T5, articular processes C4-C7 mastoid process & temporal bone rotation, extension of head & neck primary dorsal rami
Splenius capitis nuchal ligament, spinous processes C7-T3/T4, supraspinous ligament mastoid process of temporal bone, superior nuchal line flexion, extension, rotation of head primary dorsal rami
Splenius cervicis spinous processes T3-T6 transverse processes C1-C3/4 extension, rotation, & lateral bending of neck primary dorsal rami
Spinalis thoracis spinous processes T11-L2 spinous process T1-T4 extension of vertebral column primary dorsal rami
Spinalis cervicis nuchal ligament, spinous processes C7-T2 spinous processes of upper C vertebrae extension of head primary dorsal rami
Spinalis capitis transverse processes C7-T6/7, articular processes C4-C6 between superior & inferior nuchal lines extension of head primary dorsal rami
Semispinalis capitis transverse processes upper T vertebrae occipital bone extension of vertebral column (C1-T12), contralateral rotation primary dorsal rami
Multifidus sacrum, ilium, transverse processes T1-T3, articular processes C4-C7 fibers span 2-4 segments to insert on spinous processes of vertebrae above stabilization of vertebrae during local movement primary dorsal rami
Rotatores transverse processes of vertebrae, esp. thoracic region fibers span 1-2 segments to insert on lamina, transverse or spinous process of vertebrae above stabilization of vertebrae, local extension & rotation primary dorsal rami
Created by: scobb