thoracic wall Flashcards
suprasternal notch @
T2
sternal angle @
T4-T5
xiphosternal @
T9
costal margin @
L3
thoracic outlet syndrome
symptoms involving structures in superior thoracic aperature (trachea, esophagus, vessels, and n’s)
upper limit of thoracic cavity
suprapleural membrane
true ribs
upper 7, attached to sternum
false ribs
8-10 indirectly attached thru cartilage
floating ribs
11+12
diaphragm innervation
C345
sensory:
- central: phrenic
- peripheral: innercostal
motor: phrenic
external intercostal muscle mvmt
elevate ribs
internal intercostal mucles mvmt
depress ribs
ext intercostal direction
hands in pockets
int intercostal direction
hands in neighbors pockets, at rt angles to ext IC
innermost intercostal muscle action
depresses ribs
innermost intercostal muscles
transversus thoarcis
innermost intercostal
subcostal
internal thoracic A branches
superior epigastric
musculophrenic
sup epigastric course
goes under rectus abdominis
musculophrenic course
laterally and down alont the costal cartilage margin
ant and post IC A’s do what
anastomose
posterior intercostal vein
drains into azygous venous system
ant intercostal veins
drain into internal thoracic vein
intercostal nerves
innervate all IC muscles Ventral T2-T11 somatic motor somatic sensory sympathetic
subcostal nerve
ventral T12
travels in costal grooves
ant/post thorax mvmt
pump handle mvmt of ribs 2-6 and sternum
vertical dimension thorax mvmt
increased be depression and contraction of the diaphragm
lateral dimension thorax mvmt
increased by bucket handle mvmt of lower ribs 7-10
ant/post mvmt at costotransverse joint
pump handle, upper ribs, rotation
lateral mvmt at costotransverse joint
bucket handle, lower ribs, gliding
articulation of ribs and vertebrae
rib articulates with the superior facet of the same level vertebrae and the inferior facet of the vertebrae at the level above it
very little mvmt
VAN
runs below costal grooves of ribs between 2nd and 3rd muscle layers
