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What is Development of Ribs

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In the.precartilaginous stage the costal processes of the thoracic verte­brae grow out as bars of condensed mesenchyme.As they extend laterally, they pass between the muscles de­veloping from successive thoracic myotomes. Each developing rib ac­quires a single centre of chordrification in the 7th week of development and transforms in to cartilage. The original union of the costal process with the vertebra is replaced by a synovia! joint. In each developing rib a center of ossi­fication appears near the angle in the 9th week of development. The carti­laginous ribs are progressively con­verted into bone, but their distal ends remain cartilaginous and are called costal cartilages. At puberty two sec­ondary centers of ossification appear in the tubercle and one in the head of the rib. These centers fuse with the shaft in the early adulthood.

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