Ribcage (Sceleton thoracis)

Costae

• Costae verae- 1.-7.

• Costae spuriae 8.-12.

• Costae fluctuantes 11.,12.

Each rib has bone part (pars ossea) and  cartilage part (cartilago costalis).

Typical ribs are 2nd-10th rib.

• Caput costae

• Facies articularis capitis costae
• Crista capitis costae
• Collum costae
• Tuberculum costae
• Facies articularis tuberculi costae
• Corpus costae
• Sulcus costae
• Angulus costae

Costa prima

• Tuberculum musculi scaleni anterius
• Sulcus venae subclaviae (in front of tuberculum)
• Sulcus arteriae subclaviae ( in back of tuberculum)
• Doesnt have  crista capitis costae, angulus matches tuberculum costae, has long and thin collum costae.

11th ,12th rib

Doesnt have crista capitis costae or tuberculum, weakly expressed collum, angulus and sulcus costae.

Sternum

• Manubrium sterni
• Incisura jugularis
• Incisura clavicularis
• Incisura costalis
• Corpus sterni
• Incisurae costales (6 pairs)
• Processus xiphoideus
• Angulus sterni between manubrium and corpus sterni.