Infrasternal angle

The lower opening of the thorax is formed by the twelfth thoracic vertebra behind, by the eleventh and twelfth ribs at the sides, and in front by the cartilages of the tenth, ninth, eighth, and seventh ribs, which ascend on either side and form an angle, the infrasternal angle or subcostal angle, into the apex of which the xiphoid process projects.

Infrasternal angle
The human rib cage.
The thorax from the right.
Latinangulus infrasternalis
Anatomical terminology

Pregnancy causes the angle to increase from 68° to 103°.[1]


This article incorporates text in the public domain from page 118 of the 20th edition of Gray's Anatomy (1918)

  1. Campbell LA, Klocke RA (April 2001). "Implications for the pregnant patient". Am. J. Respir. Crit. Care Med. 163 (5): 1051–4. doi:10.1164/ajrccm.163.5.16353. PMID 11316633.
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