(There are 12 pair ribs or 24 ribs are present in our thorax region and each rib attached to the vertebra on the posterior side)
1. Based on the external features
• Typical Ribs (these ribs have same external Features); 3rd, 4th, 5th,6th, 7th, 8th, and 9th Ribs have the same General Features (For this reason, not all ribs of this group have to be read separately, Only one rib has to read and another rib has the same script)
• Atypical Ribs (each rib has special external Features); 1st, 2nd, 10th, and 11th Ribs (For this reason, all these four ribs have to be read separately)
2. Based on the relation with Sternum
• True Ribs (these ribs directly connect with the Sternum on the anterior side); Upper Seven Ribs (1st, 2nd, 3rd, 4th, 5th, 6th, and 7th Ribs)
• False Ribs (these ribs connect to the Sternum indirectly or do not connect with the Sternum); Lower Five Ribs (8th, 9th, 10th Rib connects with the Sternum indirectly and 11th and 12th Rib does not connect with the Sternum)
3. Based on articulation with the Sternum
• Vertebrosternal Ribs (As clear from the name, these ribs Anteriorly attach to the Sternum and Posteriorly attach to the vertebrae); 1st, 2nd, 3rd, 4th, 5th, 6th, and 7th Rib.
• Vertebrochondral Ribs (As clear from the name, these ribs anteriorly attached to the sternum and posterior attached to the vertebrae); 8th, 9th and 10th Rib.
• Vertebral or Floating Ribs (As clear from the name, these ribs are attached only Posteriorly to the vertebrae); 11th and 12th Rib.
