The muscles which produce shoulder extension are: Latissimus Dosi & Pectoralis Major.
latissimus dorsi
what causes the left shoulder to swell
Shoulder bone dislocation or abnormal grown of shoulder bone. Check it with docs
Sometimes the stiffness is severe enough that it causes frozen shoulder.
The process that causes muscle tiredness can be reversed because once the muscle starts getting the right products it needs it can start its normal process. This is why when the muscle gets more oxygen it stops cramping.
sympathetic stimulation causes the dilator muscle to contract and sphincter muscle to relax, as a result expanding the pupil.
latissimus dorsi
The latissimus dorsi, and the trees major, which is known as the " little lat", both adduct, extend, and internally(medially) rotate the shoulder. The long head of the triceps also extend and addicts the shoulder, while also being an elbow extensor
A flexor is a muscle that causes a joint to bend. In contrast, an extension is a muscle that straightens a joint.
extensors / extensor muscles
When a muscle contracts it causes flexion and when muscles relax they cause extension
Contractions of the gluteus maximus muscle causes (hyper)extension of the thigh.
There are actually more than 4 muscles that should be immobilized. When you move your shoulders you move your clavicle. The muscles that causes movement at the shoulder joint should be immobilized. This includes the prime movers, as well as the assistant movers. The following muscles should be immobile. The subclavius which moves and depresses the clavicle as well as helps stabilize the pectoral girdle. The pectoralis minorabduct the scapula and rotates it downward, lowering your shoulders. The serratus anterior abducts the scapula and cause it to rotate upward, shrugging your shoulders. The trapezius stabilizes the scapula as well as move it, and helps extend head. The levator scapulae elevates the scapula and rotates it downward. The rhomboid majorelevates, adducts, rotates downward, and stabilizes the scapula. The Rhomboid minor does the same thing as the Rhomboid major. The pectoralis major adducts and medially rotates the arm at the shoulder joint; flexes arm at the clavicular head and extends the arm to the side of the trunk at the sternocostal head. The deltoid abducts the arm at the shoulder joint; flex and medially rotates the arm at shoulder joint; and extend and laterally rotates the arm at shoulder joint. The subscapularis medially rotates the arm at shoulder joint. The supraspinatus assists the deltoid muscle to abduct the arm at the should joint. The infraspinatuslaterally rotates and abducts the arm at the shoulder joint. The teres major extends the arm at the shoulder joint and assists in the adduction and medial rotation of the arm at the shoulder joint. The teres minor laterally rotates, extends, and adducts the arm at the shoulder joint. The coracobrachialis flexes and adducts the arm at the should joint.
what causes the left shoulder to swell
Muscles are not jointed, though the bones they attach to may be. For example, your biceps muscle attaches to both your scapula (shoulder blade) and radius (one of the forearm bones). Contracting the muscle causes the elbow joint to bend.
You can take any physician assistant tests at the place you want to work, they can ask you to do certain things to get the job and requirements for it.
Shoulder bone dislocation or abnormal grown of shoulder bone. Check it with docs
The twitch in your shoulder is just a twitch it does not hurt you at all:>