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Thorax

Thorax. Ribs and Sternum. Bony Thorax. Include Thoracic vertebrae dorsally Ribs laterally Sternum and costal cartilage anteriorly Function Secure rib to sternum Protective cage around vital organs Supports shoulder girdles and upper limbs

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Thorax

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  1. Thorax Ribs and Sternum

  2. Bony Thorax • Include • Thoracic vertebrae dorsally • Ribs laterally • Sternum and costal cartilage anteriorly • Function • Secure rib to sternum • Protective cage around vital organs • Supports shoulder girdles and upper limbs • Provides attachment points for muscles of back, chest, and shoulder • Intercostal spaces provide attachment for intercostal muscles that lift and depresses chest during breathing

  3. Sternum • Lies anterior midline of thorax • Resembles knife blade, flat, about 15 cm (6in) long • Made from 3 fused bones • Manubrium (superior) clavicular notches articulates with clavicles and first two pairs of ribs --Body (midline) forms the bulk of sternum articulates with second to seventh rib • Xiphoid process (inferior) • Attachment site for abdominal muscles

  4. Ribs • 12 Pair in males and females • Each rib articulate with both the body and the transverse process of its corresponding thoracic vertebra • From vertebral attachment, rib curve outward, then forward and downward

  5. True Rib • 1st 7 pairs • Join costal cartilage anteriorly • Connect directly to sternum

  6. False rib • Last 5 pairs of ribs • attach indirectly to sternum • Last two pairs of false ribs called floaters because they do not attach to sternum at all

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