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What group of muscles holds the head of the humerus securely in place as it rotates within the shoulder joint?
Wiki User
∙ 14y ago
rotator cuff
Wiki User
∙ 14y ago
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Which muscles flex the arm?
the anterior part of the deltoid muscle flexes and medially rotates the humerus/ the arm. to do this it is helped by muscles like coracobrachialis and pectoralis major, corachobrachialis also adduct and flex the arm at shoulder joint.
What is Codmans Paradox?
Codman's paradox refers to the observation that during shoulder abduction, the scapula (shoulder blade) initially rotates in the opposite direction to that of the humerus (upper arm bone), before eventually synchronizing their movements. This phenomenon challenges traditional biomechanical theories that suggest the scapula and humerus move together in a fixed ratio during shoulder abduction.
What 4 muscles are used to prevent movement of a broken clavicle?
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 3 muscles that rotate the humerus?
latissimus dorsi, supra spinatus , infra spinatus , teres minor , pectoralis major, teres major, brachialis , coracobrachialis, brachioradialis, pronator teres, common origin of flexors, extensor carpi radialis longus, common origin of extensors,
Which abdominal muscles rotate the trunk to the same side?
The right internal oblique and the left external oblique contract as the torso flexes and rotates to bring the left shoulder towards the right hip. The left internal oblique and the right external oblique rotates the right shoulder to the left hip (as in grapping for your seat belt). For this reason, the internal obliques are referred to as "same side rotators."
What is the function of the pectoral muscle?
The main function of the pectoralis major is to assist with the movement of the arms. It also plays a huge role in deep inhalation by pulling the ribcage out to make room for the lungs to expand.
Where is the pectoral located in the body?
The pectoralis major is the large fan like muscle located on either side of the chest, originating from the sternal half of the clavical, the anterior surface of the sternum, and the cartilage of the first seven ribs, and inserting in the bicepital groove of the humerus. Therefore, its primary actions deal with movements of the shoulder joint. It adducts, flexes, and medially rotates the humerus. There is also a pectoralis minor, which is also located on the chest, but lies deep to the pectoralis major. It originates on ribs 3-5, and inserts on the coracoid process of the scapula. The pectoralis minor works on the scapula, drawing it toward the thorax so as to increase the range of motion of the shoulder.
What is the action of the levator scapulae?
elevates, adducts, depresses, or rotates the scapula
What muscle rotates the torso?
The external and internal oblique muscles rotate and side bend the trunk. These muscles also stabilize the spine.
How does serratus anterior function as an antagonist to the rhomboideus muscles?
The serratus anterior is responsible for the protraction of the scapula. It pulls the scapula forward and around the rib cage, like when someone throws a punch. Often referred to as the "boxer's muscle". It is also responsible for stabilizing the scapula and assisting in its rotation upward.
What constitutes of the pectoral girdle?
The pectoral girdle is made up of a left pectoral girdle and a right pectoral girdle. Each set of pectoral girdles has two bones, one clavicle and one scapula. The clavicle bones on both the left and right pectoral girdles are articulated with the sternum. The clavicles are also found on the anterior or front part of the skeleton. The scapula bones on both the left and right pectoral girdles are part of the posterior appendicular skeleton. The scapula bones each articulate with clavicle and the humerus. Your pectorial girdle is located at your shoulder area on your appendicular skeleton. Your upper limb bones are attached to the pectoral (shoulder) girdle. dcart45.
Muscle that raises and rotates the arm?
You can find me in the shoulder. I raise and rotate the arm. My name is Deltoid
