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Right border of heart
The
right
border
of
the heart
is a long border on the
surface
of the
heart
, and is formed by the
right atrium
.
The
atrial
portion
is rounded and almost
vertical
; it is
situated
behind
the third,
fourth
, and
fifth
right
costal cartilages
about 1.25
cm
. from the
margin
of the
sternum
.
The
ventricular
portion
,
thin
and
sharp
, is named the
acute
margin
; it is nearly
horizontal
, and
extends
from the
sternal
end of the
sixth
right
coastal
cartilage
to the
apex of the heart
.