begins at neck passing inferolaterally and obliquely
passes inferomedially from angle to distal anterior end
elongated, blade-like
concave surface facing inwards to the thoracic cavity in contact with parietal pleura
convex external surface:
relatively superficial under skin from angle projecting anteriorly
serratus anterior attached to superior margin in superior 8 ribs
superior margin:
rounded and relatively broad
external intercostal muscle attached laterally
more deeply, internal intercostal muscle attached from sternal end to angle
as a continuation, internal intercostal membrane attached from angle to tubercle
subcostal muscles attached in deeper plane
inferior margin is thinner and runs to a sharp edge:
external intercostal muscle attached to outer surface of margin
internal intercostal muscle attached more deeply from subcostal groove progressing anteriorly
internal intercostal membrane attached from angle to tubercle
internal surface near to inferior margin houses costal groove which tapers out to a rounded, smooth edge with no recess upon reaching the anterior third of the rib
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