The Pectoralis major (clavicular head), coracobrachialis, and biceps brachia are the synergists for shoulder flexion.
For horizontal flexion, the Anterior deltoid is the synergist muscle.
The deltoids are the agonistic muscles which flex the shoulder joint. For horizontal flexion, the pectoralis major is the agonistic muscle.
agonist is anteriordelts andtriceps, antagonist is posterior delts and bicep
Those would be the shoulder extensors: long head of triceps, latissimus dorsi, teres major
An agonist muscle is a muscle that plays a part in the extension of a muscle. The agonist muscles for a knee extension are the quadriceps and hamstrings.
The muscles which produce shoulder extension are: Latissimus Dosi & Pectoralis Major.
The muscles located in the shoulder and move the arm are: the deltoid, teres major, and rotator cuff muscles. The deltoid muscle is like three muscles in one: the anterior fibers flex the shoulder, the lateral fibers abduct the arm, and the posterior fibers extend the shoulder. The rotator cuff muscles are the supraspinatus , infraspinatus , teres minor, and subscapularis . They can be remembered with the mnemonic SITS. The primary function of the rotator cuff muscles is holding the head of the humerus in the glenoid cavity. They act more to assist the other muscles.
Adrenergic agonists speed up the heart rate and relax the bronchial muscles.
Agonists
Agonists
Extension of the arm at the shoulder is due to:Latissimus DorsiPosterior fibers of the DeltoidTeres MajorExtension of the elbow joint is almost entirely due to triceps brachi
Extension of the forearm at the elbow joint is achieved almost entirely by the triceps brachii but extension of the arm, which actually takes place at the shoulder joint, is achieved by muscles on the back, such as the latissimus dorsi.
The agonists are the muscles that help you to do this exercise. The antagonists are the muscles that bring you back to a regular position instead of being stuck.
deltoids are the back shoulder muscles and trapezoids are the muscles around the shoulder/neck/back area
The shoulder press works the upper body muscles such as the deltoids and the triceps. The shoulder press also involves the core muscles.
Muscles within the brachium are responsible for the extension of the elbow. These muscles also work for the flexing of the arm as well.