Trunk Flashcards
origin: ribs 5-12
insertion: linea alba
action: laterally rotates trunk
external abdominal oblique
origin: iliac crest
insertion: linea alba
action: laterally rotates trunk
internal abdominal oblique
origin: iliac crest
insertion: linea alba
action: laterally rotates trunk
transversus abdominis
origin: crest of pubis
insertion: xiphoid process
action: compresses abdominal wall
rectus abdominis
origin: ribs 1-8
insertion: vertebral border
action : abducts scapula
serratus anterior
origin: inferior border of a rib
insertion: superior border of rib below
action: elevates ribs
external intercostals
origin: inferior border of a rib
insertion: superior border of rib below
action: depresses ribs
internal intercostals
origin: lowers ribs
insertion: central tendon
action: inspiration (contraction)
diaphragm
origin: vertebral column
insertion: vertebral column
action: extends and rotates vertebral column and head
Iliocostalis, longissimus, spinalis
origin: sacrum
insertion: vertebral column
action: extends and rotates vertebral column
multifidus
origin: posterior iliac crest
insertion: rib 12
action: extends and abducts vertebral column
Quadratus lumborum
origin: spines of t2-5
insertion: lower one third of vertebral border of scapula
action: adducts scapula
rhomboideus major
origin: spines c7-t1
insertion: vertebral border of scapula at scapular spine
action: adducts scapula
rhomboideus minor
origin: ligamentum nuchae
insertion: occipital and temporal bone
action: extends and rotates head
splenius
origin: c7-t12
insertion: occipital bone
action: extends head
semispinalis