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Rotator Cuff

A rotator cuff muscle prevents downward dislocation of the humerus?

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2010-01-25 22:39:27
2010-01-25 22:39:27

what is a rotator cuff muscle prevents downward dislocation of the humerus

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If the rotator cuff muscle prevents downward dislocation it tells you about the power of the muscle


Rotator Cuff Muscles (SITS) Supraspinatus Infraspinatus Teres Minor Subscapularis Rotator cuff muscles all attach to the head of the humerus and act to seat the head of the humerus firmly in the glenoid fossa to prevent shoulder dislocation. A dislocated shoulder means some/all of these muscles have been torn.


Rotator cuff is composed of four muscles. These muscles keep the head of the humerus in proximity to the scapula bone. Any force, that tries to pull away the head of the humerus will cause injury to the rotator cuff muscles. Any body can get such injury.


The rotator cuff muscles are referred to occasionally as the SITS muscles. The Supraspinatus, Infraspinatus, Teres minor and the subscapularis. The Supras. originates on the scapula and inserts on the humerus. The Infras. originates on the scapula and inserts on the humerus(greater tubercle. The Teres minor originates on the scapula and inserts on the humerus. The Subscapularis originates on the scapula and inserts on the humerus(lesser tubercle). The function of this muscle group is to stabilize the shoulder joint. Hope this helps.


The medial attachments is the scapula. The lateral attachment are the greater or lesser tubercle of the humerus


The rotator cuff muscles: Supraspinatus Infraspinatus Teres Minor Supscapularis Easily remembered as SITS.


It is a very good question! There are four muscles, which compose rotator cuff. They all keep the head of the humerus in opposition to the glenoid cavity of the scapula bone. The head of the humerus is very large. The glenoid cavity is very small. So they act like a tendon. They are 'functionally' contracting tendons. That is the beauty of this joint. That is the beauty of the nature.


The best way would be to say that the upper arm bone (the humerus) is not in the socket that it belongs in. It isn't in it's proper location. There are plenty of muscles around the joint but it is very loose because of what we normally use it for. The muscles are called 'the rotator cuff' but they are not very strong and many forces can tear it.


The supraspinatus, one of the four muscles that comprise the rotator cuff, abducts the humerus the first 15 - 20 degrees, after which the task is assumed by the deltoid.


The abnormal placement of dye may indicate rheumatoid arthritis, cysts, joint dislocation, rupture of the rotator cuff, tears in the ligament and other conditions.


The abnormal placement of dye may indicate rheumatoid arthritis, cysts, joint dislocation, tear of the rotator cuff, tears in the ligament, and other conditions.


It is a group of 4 tendons that attack to the head of the humerus. It looks kind of like 4 white flat straps attached to a pool cue ball.


The rotator cuff is comprised of four muscles. These individual muscles combine at the shoulder to form a thick "cuff" over this joint. The rotator cuff has the important job of stabilizing the shoulder as well as elevating and rotating the arm. Each muscle originates on the shoulder blade, or scapula, and inserts on the arm bone, or humerus.


Well, your 'rotator cuff' is comprised of four muscles: Supraspinatus, Infraspinatus, Teres Minor, and Subscapularis. These four muscles encompass, and therefore stabolize, the glenohumeral joint (the joint where your arm[humerus bone] joins your shoulder blade[scapula bone]). These muscles help move your arm at the shoulder in all angles. So, if you have a 'rotator cuff tear' it is an injury or strain to one or more of these muscles.



The function of the rotator cuff muscles are simply to rotate the arm medially(inwards), to assist the deltoid in abduction(lifting of the arm), and for adduction(lowering) of the arm. The rotator cuff are also known as the SITTS muscles. Supraspinatus, located closest to the front of your shoulder, Infraspinatus, right behind it, Teres Minor right behind and slightly lower, and finally Teres Major, the large muscles that connects just beneath you shoulder and to you humerus.


Rotator cuff pain is treated in many different ways, depending on the severity of the injury. The rotator cuff is the group of muscles that attach to the shoulder blade and the humerus head, and when they contract they cause shoulder rotation and abduction. Most rotator cuff injuries are actually injuries to the tendon part of the muscle group, just proximal to the insertion point on the humerus. This part of the tendon often gets torn or irritated as it passes under the acromion process of the shoulder blade. Treatment should be directed at reducing tightness and tenderness in the bellies of the rotator cuff muscles, reducing the inflammation in the tendon, and then increasing strength in the muscles. If the tear in the tendon is substantial, the conservative treatment above may not work, and surgical re-attachment or repair might be indicated. Keith E. Biggs, DC



It is a collection of four short muscles which attach to and strengthen the joint capsule. Also they pullthe humerus into the socket of the glenoid fossa joint increasing contact of the bony elements.The most important factor is it contributes to the joints stability


Rotator cuff tears are tears of one or more of the four tendons of the rotator cuffmuscles. A rotator cuff injury can include any type of irritation or damage to therotator cuff muscles or tendons.





That is the correct spelling of "rotator" (any of several spinning devices, or the human shoulder).


I asked the Moderators and they said there is no such thing called the item rotator.



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