File:Congdon1922-18-25.jpg

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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/Time	Thumbnail	Dimensions	User	Comment
current	08:26, 1 September 2012		1,200 × 795 (179 KB)	Z8600021 (talk \| contribs)
	17:05, 7 May 2011		1,153 × 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

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