The infraspinatus muscle’s action on the shoulder is primarily through its function as a rotator cuff muscle providing glenohumeral
What movement does the infraspinatus muscle do?
Action. Infraspinatus is the main external rotator of the shoulder joint. It assists in producing shoulder extension . With the arm fixed, it abducts the inferior angle of the scapula.
What is the action of the supraspinatus?
Action. Contraction of the supraspinatus muscle leads to abduction of the arm at the shoulder joint . ... The supraspinatus also helps to stabilize the shoulder joint by keeping the head of the humerus firmly pressed medially against the glenoid fossa of the scapula.
What is the origin and action of the infraspinatus?
| Origin Infraspinous fossa of scapula | Action Shoulder joint: Arm external rotation; Stabilizes humeral head in glenoid cavity | Innervation Suprascapular nerve (C5, C6) |
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What action does the infraspinatus and teres minor create?
Teres Minor, along with Infraspinatus, primarily produces external rotation of the shoulder joint . It assists in adduction and extension of the shoulder.
What is the main function of the infraspinatus muscle?
The infraspinatus muscle’s action on the shoulder is primarily through its function as a rotator cuff muscle providing glenohumeral stability . The rotator cuff applies compression upon the head of the humerus that allows for the stabilization of the humeral head during shoulder abduction.
How do you heal the infraspinatus?
- Icing your shoulder will reduce inflammation. ...
- Heat will help relax your infraspinatus. ...
- Stretches and exercises will help you improve flexibility and range of motion. ...
- NSAIDs like ibuprofen (Advil, Motrin) relieve pain and reduce swelling caused by your injury.
Where is supraspinatus pain felt?
Supraspinatus pain is felt at the side of the shoulder in the middle section of the deltoid . In some cases, it can be felt further round the front of the shoulder.
What is the action of the subscapularis muscle?
The subscapularis rotates the head of the humerus medially (internal rotation) and adducts it ; when the arm is raised, it draws the humerus forward and downward. It is a powerful defense to the front of the shoulder-joint, preventing displacement of the head of the humerus.
What is the action of the supraspinatus quizlet?
action Supraspinatus. action. Assists in abduction of the arm, stabilizes the humerus in the glenoid cavity .
What is the action of the infraspinatus muscle quizlet?
The infraspinatus muscle is a thick triangular muscle, which occupies the chief part of the infraspinatous fossa.As one of the four muscles of the rotator cuff, the main function of the infraspinatus is to externally rotate the humerus and stabilize the shoulder joint .
Which is the origin of the infraspinatus?
| Infraspinatus muscle | Origin infraspinous fossa of the scapula | Insertion middle facet of greater tubercle of the humerus | Artery suprascapular and circumflex scapular arteries | Nerve suprascapular nerve |
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What is the infraspinatus antagonist?
Antagonist: Subscapularis , pectoralis major, and latissimus dorsi.
What is the function of teres minor?
The teres minor is deep to the deltoid muscle. As a rotator cuff muscle, the teres minor stabilizes the ball-and-socket glenohumeral joint by helping hold the humeral head (ball) into the shallow glenoid cavity of the scapula (socket) . The teres minor also laterally, or externally, rotate the arm at the shoulder joint.
How can you tell the difference between infraspinatus and teres minor?
Infraspinatus & Teres Minor
These two muscles lies below the scapular spine and are external rotators of the shoulder. Infraspinatus primarily acts with the arm in neutral and Teres Minor is more active with external rotation in 90 degrees of abduction .
Can you palpate the teres major?
The Teres Major muscle can be palpated from two different locations: 1. Just below the caudal angle of the scapula 2. Deep in the posterior axilla In palpating you are looking both at observable muscle spasm or twitch as well as patient discomfort (as exhibited by a yelp, a whine, or an attempt to bite or flee.)
