"false ribs: the 8th to 10th ribs converge anteriorly to join together via costal cartilages and eventually to the seventh rib, and indirectly to the sternum"
"the first rib is short, broad, and sharply curved, with a single articular facet on its head and grooves for the subclavian vessels"
"the second rib is thinner and longer than the first and has a rough area for the attachment of the serratus anterior"
"the tenth rib often has only one facet on its head and may lack a tubercle"
"the eleventh and twelfth ribs are shorter, have a single facet on their heads, lack necks and tubercles, and do not attach anteriorly to the sternum (floating ribs)"
"The costal groove runs along the inferior border of each rib. It is situated on the internal aspect of the rib. Each costal groove accommodates an intercostal vein, artery and nerve in that order downwards."
"The costal margin is the lower margin of the thoracic wall."
"Bifid or forked ribs are an uncommon variant occurring in ~0.2% of the population. They may be more prevalent in females and the right side."
"Srb anomaly"
Expected headings
"Costal groove"
"Costal margin"
"There are 12 pairs of ribs which are separated by intercostal spaces. The first seven ribs progressively increase in length, the lower five ribs then begin to decrease in length. Ribs are highly vascular and trabecular with a thin outer layer of compact bone."
"There are a number of muscles related to ribs:"
"Ribs can also be described as true, false or floating:"
"The costal groove runs along the inferior border of each rib. It is situated on the internal aspect of the rib. Each costal groove accommodates an intercostal vein, artery and nerve in that order downwards."
"scalenus anterior, posterior and medius muscles have attachments on the first and second ribs"