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  1. #1
    yomy is offline Junior Member
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    respiratory 3 of 3

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    The intercostal neurovascular bundle is particularly vulnerable to injury from fractured ribs because of its location where?



    A. Above the superior border of the ribs, anteriorly
    B. Beneath the inferior border of the ribs, posterolaterally
    C. Between external and internal intercostal muscle layers
    D. Deep to the posterior intercostal membrane
    E. Superficial to the ribs, anteriorly

  2. #2
    yomy is offline Junior Member
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    respiratory 3 of 3

    ans is b


    Explanation
    The upper two posterior intercostal arteries arise from the costocervical trunk; the remaining arteries arise from the descending thoracic aorta. The posterior intercostal arteries anastomose with the anterior intercostal arteries, which arise from the internal thoracic artery. Laterally, the intercostal neurovascular bundle lies in the costal groove along the internal surface of the inferior border of each rib and between the inner and outer layers of the internal intercostal muscle. Indeed, scalloping of the inferior edge of the rib is a radiographic indication of increased collateral circulation through the intercostal arteries that results from a circulatory deficit elsewhere. Just as a subcostal location offers protection to the intercostal neurovascular bundle, fracture of a rib may involve tearing of these structures. The intercostal neurovascular bundle components give off a smaller accessory bundle, which lies adjacent to the upper border of the ribs. Thoracocentesis usually is performed adjacent to the upper border of the ribs to avoid the main intercostal

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