Lumbopelvic OIA

Rectus Abdominis Action

Flexes spine

Rectus Abdominis Origin

Pubic symphysis; Pubic crest

Rectus Abdominis Insertion

Costal cartilages 5-7; Xiphoid process

External Abdominal Oblique Origin

External surfaces of ribs 5-12

External Abdominal Oblique Insertion

Linea alba; Pubic tubercle; Anterior iliac crest

External Abdominal Oblique Action

Flexes spine; Contralaterally rotates spine

Internal Oblique Origin

Anterior iliac crest

Internal Oblique Insertion

Inferior border of ribs 10-12; Linae alba; Pubic crest; Pecten Pubis

Internal Oblique Action

Flexes spine; Ipsilaterally rotates spine

Transversus Abdominis Origin

Ribs 7-12; Iliac crest

Transversus Abdominis Insertion

Linae alba, Pubic crest; Pecten Pubis

Transversus Abdominis Action

Compresses and supports abdominal viscera

Quadratus Lumborum Origin

Inferior border of 12th rib; Transverse processes of L1-L4

Quadratus Lumborum Insertion

Internal lip of iliac crest

Quadratus Lumborum Action

Extends lumbar spine; Laterally flexes lumbar spine; Elevates ipsilateral pelvis

Diaphragm Origin

Xiphoid process; Ribs 7-12; L1-L3 vertebrae

Serratus Posterior Inferior Origin

Spinous processes of T11-L2

Serratus Posterior Inferior Insertion

Inferior borders of ribs 9-12

Serratus Posterior Inferior Action

Depresses ribs

Multifidus Origin

Superior articular processes of C4-C7; Transverse processes of T1-T12; Mammillary processes of L1-L5; Sacrum, Ilium

Multifidus Insertion

Spinous processes (C2-L5) of vertebrae above spanning two to four segments

Multifidus Action

Stabilizes spine