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external intercostals - origin
lower border of a rib
external intercostals - insertion
upper border of rib below
external intercostals - action
elevate ribs during inspiration
external intercostals - innervation
intercostal nerves
internal intercostals - origin
inner surface of a rib and costal cartilages
internal intercostals - insertion
upper borders of the adjacent ribs below
internal intercostals - action
draw ribs downward during forced expiration
internal intercostals - innervation
intercostal nerves
transversus thoracis - origin
inner surfaces of the lower third of the body of the sternum and adjacent surfaces of the xiphoid process
transversus thoracis - insertion
internal surfaces of the sternocostal joints associated with the second (or third) through the sixth ribs
transversus thoracis - action
depresses the ribs
transversus thoracis - innervation
intercostal nerves
quadratus lumborum - origin
iliolumbar ligament and crest of the ilium
quadratus lumborum - insertion
rib 12 and tips of the transverse processes of the L1 to L4
quadratus lumborum - action
extension and side flexion of lumbar spine, expiration
quadratus lumborum - innervation
ventral ramus of spinal nerve roots T12-L3
psoas major - origin
transverse processes and lateral bodies of the last thoracic and all lumbar vertebrae including the intevertebral discs
psoas major - insertion
lesser trochanter of femur
psoas major - action
forward flexion and side flexion of lumbar spine
flexion of the hip joint
psoas major - innervation
branches of ventral rami L1-L3
iliacus - origin
superior two thirds of the iliac fossa
inner lip of the iliac crest
iliacus - insertion
lesser trochanter of femur
iliacus - action
flexion of hip joint
iliacus - innervation
femoral nerve
rectus abdominis - origin
pubic crest and anterior pubic ligament
rectus abdominis - insertion
on the front wall of the thorax
along a horizontal line passing laterally from the xiphoid process and cutting in that order, the 7th, 6th, and 5th costal cartilages
rectus abdominis - action
expiration
flexion of the spine
rectus abdominis - innervation
lower six or seven thoracic nerves
external oblique - origin
lateral side of ribs 4-12
external oblique - insertion
iliac crest, linea alba, and contralateral rectus sheaths
external oblique - action
bilaterally: flexion of trunk and posterior tilt of pelvis
unilaterally: lateral flexion and contralateral rotation of trunk
external oblique - innervation
lower 6 thoracic nerves
internal oblique - origin
iliac crest, inguinal ligament, and throacolumbar fascia
internal oblique - insertion
ribs 9-12, linea alba and contralateral rectus sheath
internal oblique - action
bilaterally: flexion of the trunk and posterior tilt of pelvis
unilaterally: lateral flexion and ipsilateral rotation of the trunk
internal oblique - innervation
lower 6 thoracic nerves and first lumbar nerve
transversus abdominus - origin
iliac crest, thoracolumbar fascia, inner surface of the cartilages of ribs 6-12 and the inguinal ligament
transversus abdominus - insertion
linea alba
transversus abdominus - action
bilaterally: stabilization of atachment site for other abdominal muscles
compression of abdominal cavity
transversus abdominus - innervation
lower 6 thoracic nerves
first lumbar nerve