It depends. But, the triceps are 2/3 of your upper arm.
The muscles of the arm are primarily voluntary skeletal muscle. There is also involuntary muscle in the vasculature (arteries).
Skeletal Muscle
smooth tissue
pilierector muscle
type of muscle that makes up the heart
Skeletal muscle, voluntary control
Skeletal muscle is a striated muscle used to control movement of specific body parts
cardiac muscle
smooth muscle
Cardiac muscle is involuntary striated muscle, most similar to skeletal muscle which is voluntary and striated.
Smooth muscle (which is not striated)
The most abundant muscle in your body is skin
Smooth muscle makes up your intestines but Cardiac muscle makes up your arteries.
Type I muscle fibers