Axial Skeleton

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Axial Skeleton The Bony Thorax

description

Axial Skeleton. The Bony Thorax. The Bony Thorax. Includes sternum, ribs, and thoracic vertebrae Cage protects heart, lungs, and major blood vessels. The Bony Thorax - Sternum. Formed by fusion of three bones Manubrium is top heart-shaped structure, includes jugular notch - PowerPoint PPT Presentation

Transcript of Axial Skeleton

Page 1: Axial Skeleton

Axial Skeleton

The Bony Thorax

Page 2: Axial Skeleton

The Bony Thorax

• Includes sternum, ribs, and thoracic vertebrae

• Cage protects heart, lungs, and major blood vessels

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The Bony Thorax - Sternum

• Formed by fusion of three bones– Manubrium is top heart-shaped structure, includes

jugular notch– Body is middle elongated bone, fused with

manubrium at Sternal Angle– Xiphoid Process is inferior tip, fused with body at

Xiphisternal Joint

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The Bony Thorax - Sternum

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The Bony Thorax - Ribs

• Twelve pairs of ribs form walls of thoracic cage• Two sections of ribs:

– True ribs: first seven pairs, attached directly to sternum by costal cartilage

– False ribs: next five pairs either attached to cartilage of superior ribs or not attached anteriorly (two pairs called floating ribs)

• Intercostal spaces: between ribs, filled with muscles to aid in breathing

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The Bony Thorax - Ribs