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Figs. 18 to 25. The descent of the fourth aortic arch and the definitive aortic arch into the thorax

Shown in relation to the cervical vertebrae and ribs.

Legend

  • Asterisk - so-called fifth aortic arch
  • 4 - fourth aortic arch
  • d. a. - definitive aortic arch
  • R. 1 - first rib
  • in. art. - innominate artery
  • c. r. - cervical rib
  • c. c - common carotid
  • v. art. - vertebral artery
  • a. r. - remnant of segment of dorsal aorta, interrupted between third and fourth aortic arches
  • sub. art. - subclavian artery

In figures 20 and 24 the sternal bands are not yet in contact above and the definitive aortic arch has a large radius of curvature.

In figures 21 and 25 the bands have met and the arch has become sharply bent by the swinging dorsally of the heart.


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Date/TimeThumbnailDimensionsUserComment
current09:26, 1 September 2012Thumbnail for version as of 09:26, 1 September 20121,200 × 795 (179 KB)Z8600021 (talk | contribs)
18:05, 7 May 2011Thumbnail for version as of 18:05, 7 May 20111,153 × 746 (165 KB)S8600021 (talk | contribs)==Figs. 18 to 25. The descent of the fourth aortic arch and the definitive aortic arch into the thorax== Shown in relation to the cervical vertebrae and ribs. Legend * Asterisk - so-called fifth aortic arch * 4 - fourth aortic arch * d. a. - definitive