"Owing to their features, the first, eleventh and twelfth ribs are considered atypical ribs. Some authors also include the second and tenth ribs as atypical. Atypical features are summarised below:"
Line 1:36·Use the Oxford comma in 'first, eleventh and twelfth'.
"strongest, broadest and most curved"
Line 6:8·Use the Oxford comma in 'strongest, broadest and most'.