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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.
- 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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|current||09:26, 1 September 2012||1,200 × 795 (179 KB)||Z8600021|
|18:05, 7 May 2011||1,153 × 746 (165 KB)||S8600021||==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|