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MUSCLE ORIGIN Iliocostalis lumborum Lower 6 ribs Iliocostalis thoracis Lower 6 ribs Iliocostalis cervicis Upper 6 ribs Longissimus thoracis Longissimus cervicis Longissimus capitis Spinalis thoracis Spinalis cervicis Spinalis capitis Semispinalis thoracis Semispinalis cervicis Semispinalis capitis Multifidi Rotatores Interspinales Transverse processes T1-6 Transverse processes T1-5 & articular processes C4-7 Spinous processes T11-L2 Transverse processes T6-10 Transverse processes T1-6 Transverse processes T1-6 & articular processes C4-7 Upper 6 ribs Transverse processes C4-7 Transverse processes all thoracic vertebrae and adjacent part lower 10 ribs Transverse processes C2-6 Mastoid process Spinous processes T1-6 Spinous processes C6-T2 Spinous processes C2-6 Nuchal line External oblique Internal oblique Latissimus dorsi Rotates & extends spine Transverse process Lamina of vertebra above Posterior rami adjacent spinal nerves Rotate spine Extend spine Laterally flex spine k u . .co e l a s e t o N m 1 o f r f o 1 w e e i g v Pa Pre Rectus abdominis Transversus abdominis NERVE Work on both sides to extend lumbar, thoracic & cervical spines & head on neck. Adjacent Working on one posterior rami side only they produce lateral flexion and rotation to same side Muscle fibres arranged in 3 Rotates, extends layers passing & laterally flexes upwards/medially to attach to spine all spinous processes (L5-C1) Spinous processes C3-6 Transverse processes C1-4 Posterior aspect mastoid process and superior nuchal line Medial half 12th rib, Iliolumbar ligament, adjacent Quadratus lumborum transverse processes lumbar iliac crest vertebrae Splenius capitis ACTION Posterior sacrum, mamillary processes lumbar spine, transverse processes thoracic vertebrae, articular processes lower five cervical vertebrae Slips of muscle passing between transverse or spinous processes respectively Intertransversarii Splenius cervicis Tranverse processes of lumbar vertebrae INSERTION Ligamentum nuchae & spinous processes C7-T4 Front of symphysis pubis and Xiphoid process, costal pubic crest cartilages of 5th, 6th, 7th rib Lateral 3rd inguinal ligament, anterior two thirds inner lip Forms aponeurosis attaching iliac crest, thoracolumbar to its fellow at linea alba fascia, inner surface lower 6 ribs and their costal cartilages Outer lip anterior two-thirds Outer borders lower 8 ribs iliac crest forming large and their costal cartilages aponeurosis joining that from other side at linea alba Lateral 3rd inguinal ligament, Inferior border lower 4 ribs, anterior two thirds iliac crest, forms aponeurosis which joins thoracolumbar fascia its fellow at linea alba Spinous processes T7-12, all lumbar and sacral vertebrae, Intertubercular groove of posterior part outer iliac crest, humerus lower 4 ribs and inferior angle of scapula Posterior Extend head & primary rami neck, laterally flex C5, 6, 7 & rotate to same Posterior rami side C3, 4, 5 Extend lumbar Anterior rami spine, laterally T12-L4 flex to same side Lower 6/7 thoracic nerves Lower 6/7 thoracic & 1st lumbar nerves Thoracodorsal nerve C6, 7, 8