The Triceps Brachi is the antagonist for the Corachobrachialis, the Brachialis and the Biceps Brachi
Triceps brachii
The Triceps Brachii
deltoid
The pectoralis muscle.
Either the triceps brachii or the coracobrachialis.
The musculocutaneous nerve
Coracobrachialis Muscle
triceps, coracobrachialis, and pecs
This muscle flexes and adducts the humerus. It is also a synergist of the pectoralis major
When one muscle pulls, the other muscle relaxes.
for biceps it is triceps
antagonistic muscles
because you suck
A antagonist muscle is a muscle that opposes the action of another muscle. The Triceps Brachii is the antagonist of the Biceps Brachii.
Looks like you are looking for the antagonistic pair. The muscular group that flexes the arm would be the antagonistic pair of tricep brachi and the brachialis.