Because they resemble a trapezium, or diamond-shaped quadrilateral
I believe the trapzius in the middle of the back, possibly with an assist of the latissimus dorsi.
It is called cardiac muscle, or myocardium.
strap Muscle
It is called involuntary muscle or smooth muscle.
Your heart is a muscle. It is also called the myocardium. The muscle cells in the heart muscle are called myocardiocytes.
A single muscle cell is called a muscle fiber.
Your thigh muscle is called your Quadricep.
The outer covering of the muscle is called the epimysium. It surrounds the entire muscle and helps protect and support the muscle fibers within.
One type of muscle is called smooth muscle. A smooth muscle works involuntarily. The other type of muscle is called skeletal muscle. Skeletal muscle only works with a command.
This muscle is called the extensor muscle. There are specific names for different joints.
Each muscle fiber is also called a myofiber.
Voluntary.