The internal ridges of the atria are called pectinate muscles. They are muscular ridges that line the atrial walls, primarily located in the right atrium and the auricles of both atria. Pectinate muscles help increase the surface area of the atria and assist in the contraction of the atrial walls during the cardiac cycle.
pectinate muscles
The Atria and Atrium
The ridges in cerebrum are called
These are the atria - there are two in the heart.
The ridges in cerebrum are called
The left and right atrium (or atria).
The upper chambers of the heart are called the atria (singular: atrium).
the bottom/point of the heart is called the apex
More than one atrium is called "atria." The term "atria" is the plural form of atrium.
The valves that prevent blood from flowing back into the atria are called atrioventricular valves.
atria.
atria