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Questions and Answers
Which muscle is responsible for internal rotation in the rotator cuff?
Which muscle is responsible for internal rotation in the rotator cuff?
- Supraspinatus
- Infraspinatus
- Subscapularis (correct)
- Teres Minor
What is the primary function of the rotator cuff muscles as a group?
What is the primary function of the rotator cuff muscles as a group?
- Abduction of the shoulder
- Extension of the shoulder
- Flexion of the shoulder
- Stabilization of the humeral head in the glenoid fossa (correct)
Which rotator cuff muscle is an external rotator but does NOT share its function with another muscle?
Which rotator cuff muscle is an external rotator but does NOT share its function with another muscle?
- Subscapularis
- Infraspinatus (correct)
- Teres Minor
- Supraspinatus
Which muscle is both an abductor and an external rotator?
Which muscle is both an abductor and an external rotator?
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Which muscle has the same function as the Infraspinatus?
Which muscle has the same function as the Infraspinatus?
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Study Notes
Rotator Cuff Muscles
- The "SITS" muscles make up the rotator cuff group:
- Supraspinatus: Abductor and External Rotator
- Infraspinatus: External Rotator
- Teres Minor: External Rotator
- Subscapularis: Internal Rotator
Primary Function
- The primary function of the rotator cuff muscles as a group is to stabilize the humeral head in the glenoid fossa.
Muscle Functions
- Infraspinatus and Teres Minor have similar functions, as indicated by the caption "same functions as infraspinatus".
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Description
Identify the rotator cuff muscles and their functions, including abduction, external rotation, and internal rotation. Understand how they work together to stabilize the humeral head in the glenoid fossa.
