Anatomy 1 Lecture 18 - Thoracic wall and miuscles

  1. How many ribs are there? How many true ribs? Flase ribs? Floating ribs?
    What are the typical parts of a ribs?
    • Ribs-12 True-7 False-3 Floating-2
    • Head with 2 facets, Neck, tubercle, Body or shaft, Angle, Costal Groove
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  2. What are the three joints of the rib?
    • Costovertebral
    • Costotranverse
    • Costochondral
    • Sternocostal
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  3. Where is the point of articulation for the costoverterbral joint?
    • The head of the rib with the superior part of the corresponding verterbrea, the inferior part of the inferior vertebrae and the vertebral disc. It is a synovial plane joint. The radiate ligament, thickened anteriorly, surrounds the head of the rib and the two bodies of the vertebrea. Inter-articular ligament attaches the head of the rib to the intervertebral disc.
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  4. Where is the articulation of the costotransverse joint?
    • Between the tubercle of the rib and the associated transverse process.
    • Synovial plane joint.
    • Supported by superior and lateral costotransverse ligaments.
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  5. Where is the articulation of the costochondral joint?
    • Sternal end of rib with the costal cartilage
    • Primary cartilagenous joint
    • No ribs attach directly to the sternum.
  6. Where is the articulation of the sternocostal joint?
    • costal cartilage with the manubriumand sternum
    • 1 rib is primary cartilagenous joint
    • 2-7 are synovial plane joints (supported by the anterior and posterior radiate sternocostal ligaments)
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  7. How does inspiration increas the volume of the thoracis cage?
    • 1-Vetical Contraction of the diaphragm
    • 2-Transverse Bucket handle, raising of ribs 8-10
    • 3-Ant/Post pump handle movement of ribs 1-7
  8. What are the main muscles of the thorax region? 9 total
    • Pectoralis major and minor
    • Serratus anterior
    • Serratus Posterior
    • External intercostals
    • Internal intercostals
    • Innermost intercostals
    • Subcostal
    • Transverse thoracis
    • Levatores costarum
  9. External intercostals
    • 11 pairs of muscles
    • Run oblique from rib above to rib below
    • Run anterior inferior direction
    • As they reah the COSTAL CARTILAGES, they become the external intercostal membrane
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  10. Internal Intercostals
    • 11 pairs, Deep to the external intercostals, oblique at right angles to the external intercostals,posteriorly the form the interncostal membrane.
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  11. Innermost intercostals
    • 11 pairs running similar to the internal intercostals
    • Seperated by internal intercostals by the intercostal nerves and vessels
    • cover the middle 3/4 of the intercostal space
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  12. Subcostals
    • Thin muscular slips that extend from the angle of the rib on the internal surface, to the internal surface of the rib below.
    • Cross two intercostal spaces
    • Run in same direction as the internal intercostals
  13. Transverse thoracis
    • Four or Five muscle slips that arise from the zxiphoid and body of sternum, span superiorly and laterally to the 2nd and 6th costal cartilages.
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  14. Levatores costarum
    • 12 fan shaped muscles
    • arices from transverse processo f C7 to T11
    • Inferiorly and laterally insert on the ribs below.
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  15. Where do the intercostal nerves come from?
    • The ventral primary rami of the first 11 thoracic spinal nerves
    • The 12th is called the subcostal nerve.
  16. How do the intercostal spaces receive their blood supply?
    • A large posterior intercostal artery arising from the aorta and a small intercostal artery arising from the internal thoracic artery which arises from the subclavian artery
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Card Set
Anatomy 1 Lecture 18 - Thoracic wall and miuscles
UNLV DPT 744 Gross Anatomy 1 Lecture 18 - Thoracic wall and muscles