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A rotator cuff muscle prevents downward dislocation of the humerus?
Wiki User
∙ 14y ago
Primarily (90% of the time, especially in a resting position) this job is performed by the supraspinatus muscle, and is assisted slightly by the infraspinatus and teres minor. When you are lifting something, or actively using the arm it tends to be the larger deltoids muscle that will kick in and keep the humerus from displacing inferiorly.
Wiki User
∙ 14y ago
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Why would a dislocated shoulder also potentially result in injury to the rotator cuff?
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.
What is the pink structure covering the head of the humerus?
Rotator cuff
What part of the rotator cuff is the most frequently injured and why?
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 supraspinatus is named for its location on the posterior aspect of the scapula above the spine What is its action?
The action of the supraspinatus is to stabilize the shoulder joint and help prevent downward location of the humerus and to assist in abduction.
What group of muscles holds the head of the humerus securely in place as it rotates within the shoulder joint?
rotator cuff
What bone do the muscles of the rotator cuff originate?
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.
What can be shown by abnormal placement of the dye?
The abnormal placement of dye may indicate rheumatoid arthritis, cysts, joint dislocation, rupture of the rotator cuff, tears in the ligament and other conditions.
What are possible abnormal results from an arthography procedure?
The abnormal placement of dye may indicate rheumatoid arthritis, cysts, joint dislocation, tear of the rotator cuff, tears in the ligament, and other conditions.
What does a torn rotator cuff look like?
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.
What is cuff muscles?
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.
What is mechanism of glenohumeral rhythm?
Glenohumeral RhythmThis is referred to as "scapulohumeral rhythm."Scapulohumeral Rhythm.Phase 1:Humerus 30° abductionScapula minimal movementClavicle 0° - 15° elevationPhase 2:Humerus 40° abductionScapula 20° rotationClavicle 30° - 36° elevationPhase 3:Humerus 60° abduction 90° external rotationScapula 30° rotationClavicle 30° - 50° posterior rotation Up to 30° elevationAll of these phases have important input by the Rotator Cuff muscles.
What is a rotator cuff injury definition?
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.
