The Thoracic Wall Flashcards
thorax
part of body b/n neck & diaphragm
mid-clavicular line
imaginary line running vertically downward from the midpoint of the clavicle
mid-axillary line
imaginary line running vertically downward from mid-axilla
manubrium:
part of the ___
lies at the level of ___
jugular (suprasternal) notch: ___
articulates with the ___
lower border articulates with the ___
rib 2 lies at the ___
sternum
T3 - T4
concave center of the upper border
clavicles & the 1st & upper part of the 2nd rib
body (manubriosternal joint, sternal angle of Louis)
manubriosternal joint
body (part of the sternum):
lies at the level of ___
articulates with ___
rib 7 lies at the ___
T5 - T9
ribs 2-7
xiphosternal joint
xiphoid process:
part of the ___
lies at the level of ___
sternum
T10
true ribs
vertebrosternal
upper 7 pairs
attached anteriorly to the sternum by costal cartilages
false ribs
lower 5 pairs
vertebrochondral ribs (8, 9, 10) - attached to each other & to 7th rib by their costal cartilages (connection to sternum is indirect)
free/floating ribs (11 & 12) - have no anterior attachment
typical ribs
ribs 3-9
typical ribs:
head
two facets for articulation w/ the corresponding vertebral bodies & the body above
typical ribs:
tubercle
facet for the transverse process of the corresponding vertebra
typical ribs:
neck
constriction b/n head & tubercle
typical ribs:
shaft/body
thin, twisted, contains a costal groove along the inferior border
typical ribs:
costal groove
contains (superior to inferior): VAN
- intercostal vein
- intercostal artery
- intercostal nerve
typical ribs:
costal angle
where the shaft bends sharply forward
atypical ribs:
first rib
important b/c ___
___ than other ribs
almost ___
___ for first vertebral body
scalene tubercle: ___
- subclavian vein crosses rib ___ to scalene tubercle
- subclavian artery & inferior trunk of brachial plexus cross rib ___ to scalene tubercle
of its relationship to the brachial plexus & large vessels of the arm
shorter & wider
horizontal
head single facet
insertion of the scalenus anterior muscle (near inner border)
- anterior
- posterior
atypical ribs:
second rib
main atypical feature is a rough area on its upper surface, the tuberosity for the serratus anterior muscle
atypical ribs:
10, 11, & 12
single facet of head for bodies of corresponding vertebrae
atypical ribs:
11 & 12
no tubercles or facets for transverse processes
intercostal muscle nerve supply
intercostal nerves
external intercostal muscles:
pass ___ from the rib above to the rib below
conform to the ___ muscles of the ___
extend from the ___ posteriorly to the ___ anteriorly
replaced anteriorly by the ___
downward & forward
external oblique, abdomen
rib tubercle, costochondral junction
external intercostal membrane
internal intercostal muscles:
pass ___ from rib above to rib below
conform to the ___ muscles of the ___
extend from ___ anteriorly to ___ posteriorly
replaced posteriorly by the ___
downard & backward
internal oblique, abdomen
sternum, angles of ribs
internal intercostal membrane
innermost intercostal layer:
___ than the other two intercostal muscles
best distinguished by the fact that they ___
the ___ of both the thoracic & abdominal walls lies b/n the middle & deepest layer of muscles
less well developed
are separated form the internal intercostal muscles by the neurovascular bundles
neurovascular plane
innermost intercostal layer:
innermost intercostal muscles (intercostalis intimi)
similar to internal intercostal muscles