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.
Details
Identifiers
Latin	angulus infrasternalis
TA98	A02.3.04.008
TA2	1103
FMA	7573
Anatomical terminology [edit on Wikidata]

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