flag test 1 - attachments

longissimus

everything TP except posterior aspect of mastoid process for capitis superior

spinalis

everything SP except ligamentum nichae inferior for cervicis

iliocostalis

ribs except cervicis TP superior and lumb iliac crest inferior

external oblique and internal obliques

EO - origin - lower ribs , insertion - iliac crest
IO - origin - iliac crest, insertion - lower ribs

transversus abdominis

posterior attachment - thoracolumbar fascia
anterior attatchment - linea alba

psoas

superior - L tps inferior - lesser trochanter

quadratus lumborum

superior L1-4 TPs and iliac crest inferior L5 TP and 12th rib

multifidus lumborum origin

posterior sacrum (fused transverse processes) - inferior attachment

rectus abdominis

origin (mostly inferiorally) : pubic tubercle

• insertion: anterior ribcage - costal cartilages and lower sternum