Rotator Cuff Muscles Flashcards
What muscles comprise the rotator cuff?
SItS
- supraspinatus
- infraspinatus
- teres minor
- subscapularis
What is the action of the supraspinatus muscle?
The supraspinatus muscle abducts the arm initially, prior to deltoid involvement.
What nerve innervates the supraspinatus muscle?
Suprascapular nerve
What muscle is the most commonly injured during a rotator cuff injury?
Supraspinatus
How can damage to the supraspinatus muscle be assessed?
It is assessed by the empty/full can test.
What is the action of the infraspinatus muscle?
The infraspinatus muscle laterally rotates the arm.
What nerve innervates the infraspinatus muscle?
Suprascapular nerve
What type of injury usually results in infraspinatus muscle injury?
Pitching Injury
What is the action of teres minor?
Teres minor adducts and laterally rotates the arm.
What nerve innervates teres minor?
Axillary Nerve
What is the action of the subscapularis muscle?
Subscapularis muscle medially rotates and adducts the arm.
What nerve innervates the subscapularis muscle?
upper/lower subscapular nerves
What nerve roots typically innervate the rotator cuff?
C5-C6
