costal margin
(redirected from arcus costalis)costal margin
[TA]that portion of the inferior aperture of the thorax formed by the articulated cartilages of the seventh to tenth (that is, false) ribs.
Farlex Partner Medical Dictionary © Farlex 2012
costal margin
The lower (abdominal) border of the front of the rib cage formed by the costal cartilages of ribs 7 to 10.
See also: margin
Medical Dictionary, © 2009 Farlex and Partners