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© 2015 Pearson Education, Inc. The Bony Thorax Forms a cage to protect major organs Consists of three parts 1.Sternum 2.Ribs True ribs (pairs 1–7) False.

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Presentation on theme: "© 2015 Pearson Education, Inc. The Bony Thorax Forms a cage to protect major organs Consists of three parts 1.Sternum 2.Ribs True ribs (pairs 1–7) False."— Presentation transcript:

1 © 2015 Pearson Education, Inc. The Bony Thorax Forms a cage to protect major organs Consists of three parts 1.Sternum 2.Ribs True ribs (pairs 1–7) False ribs (pairs 8–12) Floating ribs (pairs 11–12) 3.Thoracic vertebrae

2 Sternum Also called “breastbone” Comprised of 3 bones: – Manubrium – Body – Xiphoid process Jugular notch – upper border of the manubrium

3 Ribs There are 12 rib pairs All of them articulate posteriorly with the thoracic vertebrae The ribs are arranged accordingly: – 7 pairs called true ribs- attach directly to the sternum via costal (hyaline) cartilage – 5 pairs called false or floating: 3 pairs attach indirectly to sternum 2 pairs float as they aren’t attached to sternum at all

4 Figure 5.22a The bony thorax (thoracic cage). Clavicular notch True ribs (1–7) False ribs (8–12) (a) Floating ribs (11, 12) L 1 vertebra Costal cartilage Intercostal spaces T 1 vertebra Jugular notch Manubrium Sternal angle Body Xiphisternal joint Xiphoid process Sternum

5 Figure 5.22b The bony thorax (thoracic cage). Jugular notch Sternal angle Heart Xiphisternal joint T2T2 T3T3 T4T4 T9T9 (b)


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